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标题: gwd-9-24 [打印本页]

作者: knight9514 时间: 2005-11-7 07:18 标题: gwd-9-24

Q24:

A certain fruit stand sold apples for $0.70 each and bananas for $0.50 each. If a customer

purchased both apples and bananas from the stand for a total of $6.30, what total number

of apples and bananas did the customer purchase?

A. 10

B. 11

C. 12

D. 13

E. 14

已经晕了，不是买9个苹果就6.3块了么？7只有乘以9后个位才会是3，苹果和香蕉一起买怎么也买不出6.3块啊？

作者: sammen 时间: 2005-11-7 10:16

0.7*4+0.5*7=6.3

作者: daoying 时间: 2005-11-8 06:54

我拼出来是4个苹果+7个香蕉=4*0.7+7*0.5=6.3

但是答案不是11啊,不懂!

作者: himba 时间: 2005-11-8 07:06

apple(0.7) banana(0.5) banana(0.5)Apple

1x0.7 5.6/0.5=I , no 1x0.5 5.8/0.7, no

2x0.7 4.9/0.5=I, no 2x0.5 5.3/0.7, no

3x0.7 4.2/0.5, no 3x0.5 4.8/0.7, no

4x0.7 3.5/0.5, yes 4x0.5 4.3/0.7, no

5x0.7 2.8/0.5, no 5x0.5 3.8/0.7, no

6x0.7 2.1/0.5, no 6x0.5 3.3/0.7, no

7x0.7 1.4/0.5, no 7x0.5 2.8/0.7, yes

8x0.7 0.7/0.5, no 8x0.5 2.3/0.7, no

9x0.7 yes, 9x0.5 1.8/0.7,no

10x0.5 1.3/0.7, no

11x0.5 0.8/0.7, no

So, 11 is the only possible answer.

作者: poorleafs 时间: 2005-11-11 21:08

0.7x+0.5y=0.63 =>x=(0.63-0.5y)/0.7=9-(5y)/7 => y=7, x=4.

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apple(0.7)	banana(0.5)	banana(0.5)Apple
1x0.7	5.6/0.5=I , no	1x0.5	5.8/0.7, no
2x0.7	4.9/0.5=I, no	2x0.5	5.3/0.7, no
3x0.7	4.2/0.5, no	3x0.5	4.8/0.7, no
4x0.7	3.5/0.5, yes	4x0.5	4.3/0.7, no
5x0.7	2.8/0.5, no	5x0.5	3.8/0.7, no
6x0.7	2.1/0.5, no	6x0.5	3.3/0.7, no
7x0.7	1.4/0.5, no	7x0.5	2.8/0.7, yes
8x0.7	0.7/0.5, no	8x0.5	2.3/0.7, no
9x0.7	yes,	9x0.5	1.8/0.7,no
		10x0.5	1.3/0.7, no
		11x0.5	0.8/0.7, no