gmatophobia
PS Question 2 - Dec 08 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. 20
B. 21
C. 22
D. 23
E. 24
Source:
Manhattan GMAT | Difficulty: Hard
lets chart out the timeline
(9 = max age of a child she baby-sat)->18--(4yrs elapsed)--22 --(10yrs elapsed)->32(current timeline)
so current age of oldest baby = 9+4+10 = 23
option D ?
AbhinavKumar
gmatophobia
PS Question 2 - Dec 08 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. 20
B. 21
C. 22
D. 23
E. 24
Source:
Manhattan GMAT | Difficulty: Hard
lets chart out the timeline
(9 = max age of a child she baby-sat)->18--(4yrs elapsed)--22 --(10yrs elapsed)->32(current timeline)
so current age of oldest baby = 9+4+10 = 23
option D ?
Writing again because previous explanation may seem a little unorganized - the baby age of 9yrs and jane being 18 at that time is a simultaneous condition, so as Jane’s age jumps from 18 to 32 (i.e 14 yrs elapsed), so does this passing of time happens to 9 yrs old baby, bringing him to current age of 9+14 years = 23 yrs