3个迷惑的PREP数学题~大家帮忙看看呀~手都敲疼了地说

BERYL1986 · 发表于 2010-1-3 22:35:11

后天就要考试了，发现笔记本上还有3个没完全明白的数学题，请大家帮帮忙忙哈！
1.Malic’s recipe for 4 servings of a certain dish requires 1.5 cups of pasta. According to this recipe, what is the number of cups of pasta that Malic will use the next time he prepares this dish?
A. The next time he prepares this dish, Mlic will make half as many servings as he did the last time he prepared the dish.
B. Malic used 6 cups of paste the last time he prepares this dish.
Answer:C
这题的第一句话不是可以算出6吗？为什么还要选B?

2.At a certain supplier, a machine of type A costs 2000 and a machine of type B costs 50000. Each machine can be purchased by making a 20 percent down payment and repaying the remainder of the cost and the financial charges over a period of time. If the financial charges are equal to 40% of the remainder of the cost, how much less would 2 machines of type A cost than 1 machine of type B under this arrangement.
A10000 B11200 C12000 D12800 E13200
Answer:E
我的计算方法是：2 machines of type A 40000*0.8*1.4
1 machine of type B 50000*0.8*1.4
差额为10000*0.8*1.4= 11200

3.One kilogram of a certain coffee blend consists of X kilogram of type1 coffee and y kilogram of type2 COFFEE. The cost of the blend is C dollars per kilogram, where C=6.5x+8.5y. IS X<0.8
(1)y>0.15
(2)c>=7.3
选B
这题不会哦，感觉都推不出来啊。

caixinni · 发表于 2010-1-3 23:06:50

1. 那个recipe只是说做4份的量需要1.5杯pasta。并没有说明Malic这次用了多少pasta。而题目是问 Malic下次做这个dish的时候会用多少杯pasta。
要条件一和条件二同时存在时才能知道答案。

2. 楼主忘记把首付的20%算进去咯～首付的差值是3000 加上楼主算出的分期付款的差额刚好是答案中的13200

3. 因为x+y=1把它带入题干中的C的表达式，再加上条件(2) 易得X<=0.6

BERYL1986 · 发表于 2010-1-3 23:29:05

我真是粗心滴说~都错这种问题上啦~谢谢你拉！还以为没人回了郁闷地准备睡觉了呢！万分感谢！

caixinni · 发表于 2010-1-3 23:33:49

哈哈我也是后天考～加油呀～

BERYL1986 · 发表于 2010-1-3 23:40:19

恩恩，你RP和IQ都这么好一定没问题的~

caixinni · 发表于 2010-1-3 23:44:34

谢谢咯～你考试的时候就不要犯粗心啦～

我们都没问题的哈！

BTW 你辛苦打出来的题目里面第二题啊a machine of type A costs 应该是20000 不是2000～

3个迷惑的PREP数学题~大家帮忙看看呀~手都敲疼了地说

谢谢啦~

你也加油！

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