標題:
數學題目 (20點)
發問:
1) Solve the following equations(a) x-5 x+8---- = ----- 4 6(b)3(1 - 0.3x) 5------------- + 1 = --- 4 8(c)2x + 5 x - 2-------- - ------- = 6 3 22) Mr. Chan spends $8400 each month and saves the rest which is 2/9... 顯示更多 1) Solve the following equations (a) x-5 x+8 ---- = ----- 4 6 (b) 3(1 - 0.3x) 5 ------------- + 1 = --- 4 8 (c) 2x + 5 x - 2 -------- - ------- = 6 3 2 2) Mr. Chan spends $8400 each month and saves the rest which is 2/9 of his income. Find his monthly income. Solution : Let __________ , 3) There are 820 audiences in a cinema. The numbers of male audiences is 46 more than female audiences. How many female audiences are there in the cinema? Solution : Let __________ , 4) Mother has just bought 15 pears and oranges in the supermarket. The price of a pear and an orange are $3 and $5 respectively. If mother has paid $59 on buying the fruits, how many orange has mother bought? Solution : Let __________ , 5) Boddy had 4 $20-banknotes. He used 65% of the total amount to buy 2 toy cars of the same price . How much was a toy car? Solution : 6) A digital camera wth marked price of $3200 was sold at $2720. Find the discount per cent. Solution : 7) There is a sale at the cake shop and a promotion of ''buy 4 and get 1 free'' is offered to all customers. Find the discount per cent. Solution : 8) A shop is having a summer sale. All balls and Sports wears are sold at discount per cent of 30% and 15% respectively. Gary bought 2 basketballs and 1 yrack suit testerday, how much did he pay ? [basketball $125] [track suit $208] Solution : 9) Mr Wong's salary increases by 6% this month and it becomes $9010. What was Mr. Wong's original salary ? Let __________ , 10) A computer is sold at $3690 and the loss per cent is 18%. Find the cost price of the computer. Solution : Let __________ , 11) A cupboard is sold at $4900 and the profit per cent is 40%. (a) What is the cost price of the cupboard ? (b) If the cupboard is sold at $3220, what is the loss per cent ? Solution :
最佳解答:
A (x-5)/4= (x+8)/6 6x-30=4x+32 2x=62 x=31 b) 3(1 - 0.3x)/4+1= 5/8 3(1 - 0.3x)/4=-3/8 6-1.8x=-3 9=1.8x 5=x (c) (2x+5)/3-(x-2)/2=6 2(2x+5)-3(x-2)=36 4x+10-3x+6=36 x=20 2) Mr. Chan spends $8400 each month and saves the rest which is 2/9 of his income. Find his monthly income. Let his income is y , y(1-2/9)=8400 y=8400*9/7 y=10800 3) There are 820 audiences in a cinema. The numbers of male audiences is 46 more than female audiences. How many female audiences are there in the cinema? Let there are y female audiences y+y+46=820 2y=774 y=387 4) Mother has just bought 15 pears and oranges in the supermarket. The price of a pear and an orange are $3 and $5 respectively. If mother has paid $59 on buying the fruits, how many orange has mother bought? Let she bought y oranges 5y+3(15-y)=59 5y-3y+45=59 2y=14 y=7 5) Boddy had 4 $20-banknotes. He used 65% of the total amount to buy 2 toy cars of the same price . How much was a toy car? let a toy car was $y 2y=4*20*65% y=26 6) A digital camera wth marked price of $3200 was sold at $2720. Find the discount percent. (3200-2720)/3200*100% =15% the discount percent is 15% off 2009-08-17 16:20:35 補充： 7) There is a sale at the cake shop and a promotion of ''buy 4 and get 1 free'' is offered to all customers. Find the discount percent. (5-4)/5*100% =20% the discount percent is 20% 2009-08-17 16:20:45 補充： 8) A shop is having a summer sale. All balls and Sports wears are sold at discount per cent of 30% and 15% respectively. Gary bought 2 basketballs and 1 yrack suit testerday, how much did he pay ? [basketball $125] [track suit $208] 125*70%*2+208*85% =$351.8 2009-08-17 16:21:55 補充： 9) Mr Wong's salary increases by 6% this month and it becomes $9010. What was Mr. Wong's original salary ? Let _Mr. Wong's original salary is y y(1+6%)=9010 y=8500 2009-08-17 16:23:22 補充： 10) A computer is sold at $3690 and the loss per cent is 18%. Find the cost price of the computer. Let _the cost price of the computer is y y*(1-18%)=3690 y=4500 2009-08-17 16:25:30 補充： 11) A cupboard is sold at $4900 and the profit per cent is 40%. (a) What is the cost price of the cupboard ? let the cost price of the cupboard is y y(1+40%)=4900 y=3500 (b) If the cupboard is sold at $3220, what is the loss per cent ? (3500-3220)/3500 *100% =8%
其他解答:
數學題目 (20點)
發問:
1) Solve the following equations(a) x-5 x+8---- = ----- 4 6(b)3(1 - 0.3x) 5------------- + 1 = --- 4 8(c)2x + 5 x - 2-------- - ------- = 6 3 22) Mr. Chan spends $8400 each month and saves the rest which is 2/9... 顯示更多 1) Solve the following equations (a) x-5 x+8 ---- = ----- 4 6 (b) 3(1 - 0.3x) 5 ------------- + 1 = --- 4 8 (c) 2x + 5 x - 2 -------- - ------- = 6 3 2 2) Mr. Chan spends $8400 each month and saves the rest which is 2/9 of his income. Find his monthly income. Solution : Let __________ , 3) There are 820 audiences in a cinema. The numbers of male audiences is 46 more than female audiences. How many female audiences are there in the cinema? Solution : Let __________ , 4) Mother has just bought 15 pears and oranges in the supermarket. The price of a pear and an orange are $3 and $5 respectively. If mother has paid $59 on buying the fruits, how many orange has mother bought? Solution : Let __________ , 5) Boddy had 4 $20-banknotes. He used 65% of the total amount to buy 2 toy cars of the same price . How much was a toy car? Solution : 6) A digital camera wth marked price of $3200 was sold at $2720. Find the discount per cent. Solution : 7) There is a sale at the cake shop and a promotion of ''buy 4 and get 1 free'' is offered to all customers. Find the discount per cent. Solution : 8) A shop is having a summer sale. All balls and Sports wears are sold at discount per cent of 30% and 15% respectively. Gary bought 2 basketballs and 1 yrack suit testerday, how much did he pay ? [basketball $125] [track suit $208] Solution : 9) Mr Wong's salary increases by 6% this month and it becomes $9010. What was Mr. Wong's original salary ? Let __________ , 10) A computer is sold at $3690 and the loss per cent is 18%. Find the cost price of the computer. Solution : Let __________ , 11) A cupboard is sold at $4900 and the profit per cent is 40%. (a) What is the cost price of the cupboard ? (b) If the cupboard is sold at $3220, what is the loss per cent ? Solution :
最佳解答:
A (x-5)/4= (x+8)/6 6x-30=4x+32 2x=62 x=31 b) 3(1 - 0.3x)/4+1= 5/8 3(1 - 0.3x)/4=-3/8 6-1.8x=-3 9=1.8x 5=x (c) (2x+5)/3-(x-2)/2=6 2(2x+5)-3(x-2)=36 4x+10-3x+6=36 x=20 2) Mr. Chan spends $8400 each month and saves the rest which is 2/9 of his income. Find his monthly income. Let his income is y , y(1-2/9)=8400 y=8400*9/7 y=10800 3) There are 820 audiences in a cinema. The numbers of male audiences is 46 more than female audiences. How many female audiences are there in the cinema? Let there are y female audiences y+y+46=820 2y=774 y=387 4) Mother has just bought 15 pears and oranges in the supermarket. The price of a pear and an orange are $3 and $5 respectively. If mother has paid $59 on buying the fruits, how many orange has mother bought? Let she bought y oranges 5y+3(15-y)=59 5y-3y+45=59 2y=14 y=7 5) Boddy had 4 $20-banknotes. He used 65% of the total amount to buy 2 toy cars of the same price . How much was a toy car? let a toy car was $y 2y=4*20*65% y=26 6) A digital camera wth marked price of $3200 was sold at $2720. Find the discount percent. (3200-2720)/3200*100% =15% the discount percent is 15% off 2009-08-17 16:20:35 補充： 7) There is a sale at the cake shop and a promotion of ''buy 4 and get 1 free'' is offered to all customers. Find the discount percent. (5-4)/5*100% =20% the discount percent is 20% 2009-08-17 16:20:45 補充： 8) A shop is having a summer sale. All balls and Sports wears are sold at discount per cent of 30% and 15% respectively. Gary bought 2 basketballs and 1 yrack suit testerday, how much did he pay ? [basketball $125] [track suit $208] 125*70%*2+208*85% =$351.8 2009-08-17 16:21:55 補充： 9) Mr Wong's salary increases by 6% this month and it becomes $9010. What was Mr. Wong's original salary ? Let _Mr. Wong's original salary is y y(1+6%)=9010 y=8500 2009-08-17 16:23:22 補充： 10) A computer is sold at $3690 and the loss per cent is 18%. Find the cost price of the computer. Let _the cost price of the computer is y y*(1-18%)=3690 y=4500 2009-08-17 16:25:30 補充： 11) A cupboard is sold at $4900 and the profit per cent is 40%. (a) What is the cost price of the cupboard ? let the cost price of the cupboard is y y(1+40%)=4900 y=3500 (b) If the cupboard is sold at $3220, what is the loss per cent ? (3500-3220)/3500 *100% =8%
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