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The ratio of evaporated water to the quantity of water left

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The ratio of evaporated water to the quantity of water left [#permalink] New post 28 Jan 2011, 00:46
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20% (00:00) correct 80% (01:18) wrong based on 5 sessions
Hi could you please help in this DS question - I can;t seem to understand it.

A water container is full. 10% of water evaporate everyday because of heat. If no one has removed from or added to it what will be the ratio of the quantities of water yesterday and today?

I.The ratio of evaporated water to the quantity of water left over after two days is 1:4

II.The quantity of water evaporated in the last two days is 300 gallons.

A) Statement (I) ALONE is sufficient, but statement (II) alone is not sufficient.
B) Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) Each statement alone is sufficient.
E) Statement (I) and (II) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed
[Reveal] Spoiler: OA
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Re: A water container [#permalink] New post 29 Jan 2011, 11:24
rk21857 wrote:
Hi could you please help in this DS question - I can;t seem to understand it.

A water container is full. 10% of water evaporate everyday because of heat. If no one has removed from or added to it what will be the ratio of the quantities of water yesterday and today?



Hi,

this can't be a real DS question, since the question stem provides everything you need to answer the question (and statement (1) actually contradicts the info in the stem).

If 10% evaporates every day, then the ratio of "yesterday" to "today" will always be 100%:90% = 10:9.

After two days there will be 81% of the water left; statement (1) says that there will only be 80% left.
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Re: A water container [#permalink] New post 29 Jan 2011, 19:39
Hi Stuart - thanks for the reply.
Re: A water container   [#permalink] 29 Jan 2011, 19:39
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