If 4 small boxes and 5 big boxes weigh the same as 11 small

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If 4 small boxes and 5 big boxes weigh the same as 11 small [#permalink]

09 Oct 2010, 12:07

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50% (01:32) correct

50% (00:58) wrong

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If 4 small boxes and 5 big boxes weigh the same as 11 small boxes and 2 big boxes, how much does one small box weigh?

1. One big box weighs 1 kg more than one small box.
2. The ratio of the weight of one small box to the weight of one big box is \frac{3}{7} .

How can you immediatly tell that the second statement only reiterates the information provided by the stem ?

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Re: Boxes [#permalink]

09 Oct 2010, 12:13

Barkatis wrote:

Given: 4s+5b=11s+2b --> 3b=7s.
Question: s=?

(1) b=s+1 --> 3b=3(s+1)=7s --> s=\frac{3}{4}. Sufficient.
(2) \frac{s}{b}=\frac{3}{7} --> 3b=7s, the same info as in stem. Not sufficient.

Answer: A.
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Re: Boxes [#permalink] 09 Oct 2010, 12:13

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If 4 small boxes and 5 big boxes weigh the same as 11 small

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If 4 small boxes and 5 big boxes weigh the same as 11 small

If 4 small boxes and 5 big boxes weigh the same as 11 small

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