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Jane started baby-sitting when she was 18 years old. Whenever she baby

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Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 10 Aug 2011, 22:42
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Jane started baby-sitting when she was 18 years old. Whenever she baby-sat for a child, that child was no more than half her age at the time. Jane is currently 32 years old, and she stopped baby-sitting 10 years ago. What is the current age of the oldest person for whom Jane could have baby-sat?

A. 21
B. 22
C. 23
D. 24
E. 25

Open discussion of this question is here: https://gmatclub.com/forum/jane-started ... 14749.html
[Reveal] Spoiler: OA

Last edited by Bunuel on 23 Jun 2017, 06:32, edited 3 times in total.
Renamed the topic and edited the question.

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Re: Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 11 Aug 2011, 00:08
Current age of oldest child for whom Jane baby sat = Child for whom she baby-sat when she was 18 = 9 + 14 = 23

(C).
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Re: Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 11 Aug 2011, 01:22

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Re: Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 21 Aug 2011, 14:49
Jane 18 22 32

Babies <=9

oldest baby = 9 year old baby that she could have baby sat when she was 18.

oldest baby's current age = 9+14 (as its been 14 years since she sat that baby) = 23

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Re: Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 23 Jun 2017, 05:17
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: Jane started baby-sitting when she was 18 years old. Whenever she baby [#permalink]

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New post 23 Jun 2017, 06:33
ruturaj wrote:
Jane started baby-sitting when she was 18 years old. Whenever she baby-sat for a child, that child was no more than half her age at the time. Jane is currently 32 years old, and she stopped baby-sitting 10 years ago. What is the current age of the oldest person for whom Jane could have baby-sat?

A. 21
B. 22
C. 23
D. 24
E. 25




Check two extreme cases:
Jane = 18, child = 9, years ago = 32-18 = 14 --> child's age now = 9+14 = 23;
Jane = 22, child = 11, years ago = 32-22 = 10 --> child's age now = 11+10 = 21.

Answer: C.

Open discussion of this question is here: https://gmatclub.com/forum/jane-started ... 14749.html
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Re: Jane started baby-sitting when she was 18 years old. Whenever she baby   [#permalink] 23 Jun 2017, 06:33
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Jane started baby-sitting when she was 18 years old. Whenever she baby

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