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# DS Question - Word Problem

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Intern
Joined: 20 Feb 2019
Posts: 1
DS Question - Word Problem  [#permalink]

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21 Feb 2019, 05:22
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Question Stats:

67% (01:31) correct 33% (01:11) wrong based on 3 sessions

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Hi guys! I got this question on the GMAT official practice test. Could you please explain?

The cost of a square slab is proportional to its thickness and also proportional to the square of its length. What is the cost of a square slab that is 3 meters long and 0.1 meter thick?

(1) The cost of a square slab that is 2 meters long and 0.2 meter thick is \$160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
(2) The cost of a square slab that is 3 meters long and 0.1 meter thick is \$200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.

Source: Official GMAT Practice Test 1

I really can't figure out how it is possible that the answer is that provided. Could you please explain me the reationale?

Math Expert
Joined: 02 Sep 2009
Posts: 53716
Re: DS Question - Word Problem  [#permalink]

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21 Feb 2019, 05:37
GM2908 wrote:
Hi guys! I got this question on the GMAT official practice test. Could you please explain?

The cost of a square slab is proportional to its thickness and also proportional to the square of its length. What is the cost of a square slab that is 3 meters long and 0.1 meter thick?

(1) The cost of a square slab that is 2 meters long and 0.2 meter thick is \$160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
(2) The cost of a square slab that is 3 meters long and 0.1 meter thick is \$200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.

Source: Official GMAT Practice Test 1

I really can't figure out how it is possible that the answer is that provided. Could you please explain me the reationale?

Discussed here: https://gmatclub.com/forum/the-cost-of- ... 83652.html

LOCKED.
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Re: DS Question - Word Problem   [#permalink] 21 Feb 2019, 05:37
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