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

ruturaj

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Updated on: 23 Jun 2017, 06:32

Originally posted by ruturaj on 10 Aug 2011, 22:42.
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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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

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C

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11 Aug 2011, 00:08

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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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Also discussed here:
jane-baby-sitting-114749.html

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21 Aug 2011, 14:49

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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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23 Jun 2017, 06:33

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ruturaj

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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