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An animal shelter began the day Tuesday with a ratio of 5 cats for eve

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An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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An animal shelter began the day Tuesday with a ratio of 5 cats for every 11 dogs. If no new animals arrived at the shelter, and the only animals that left the shelter were those that were adopted, what was the ratio of cats to dogs at the end of the day Tuesday?

(1) No cats were adopted on Tuesday.

(2) 4 dogs were adopted on Tuesday.

Kudos for a correct solution.
[Reveal] Spoiler: OA

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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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New post 23 Jan 2015, 08:46
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Bunuel wrote:
An animal shelter began the day Tuesday with a ratio of 5 cats for every 11 dogs. If no new animals arrived at the shelter, and the only animals that left the shelter were those that were adopted, what was the ratio of cats to dogs at the end of the day Tuesday?

(1) No cats were adopted on Tuesday.

(2) 4 dogs were adopted on Tuesday.

Kudos for a correct solution.



1) we don't know how many dogs have been adopted.
not sufficient.

2) we don't know how many cats have been adopted
not sufficient.

1+2) 5x/11x-4 is the ratio; we still don't know what's the value of x. Not sufficient.
Answer E.
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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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New post 23 Jan 2015, 09:46
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Any statement provide enough information about both Dog and Cats is qualified.
1/ Know the number of Cats. (Not Dogs)
2/ The Q did not say: all adopted leave. It just said: if leave, must be adopted => Know nothing about the number of Dogs.
=> E

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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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Bunuel wrote:
An animal shelter began the day Tuesday with a ratio of 5 cats for every 11 dogs. If no new animals arrived at the shelter, and the only animals that left the shelter were those that were adopted, what was the ratio of cats to dogs at the end of the day Tuesday?

(1) No cats were adopted on Tuesday.

(2) 4 dogs were adopted on Tuesday.

Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION:

A fairly common trap on ratio problems is for students to forget that a change in "actual number" (in this case, -4 dogs) can't necessarily be applied to the change in ratio unless the ratio provides a link to actual number. In this case, consider two hypotheticals that prove that the statements together are not sufficient:

There were exactly 5 cats and 11 dogs at the beginning of the day, meaning that there were 5 cats and 7 dogs at the end of the day, a ratio of 5 : 7.

or

There were 10 cats and 22 dogs at the end of the day. By the end of the day, there would be 10 cats and 18 dogs for a ratio of 5 : 9.

Since multiple ratios are possible, the statements together are not sufficient.

Answer: E.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve [#permalink]

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New post 31 Aug 2017, 19:33
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: An animal shelter began the day Tuesday with a ratio of 5 cats for eve   [#permalink] 31 Aug 2017, 19:33
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