If a young child was 17 months old one year ago, how old was the child, in months, x months ago? Pick one:
A) x − 29 B) x − 12 C) 17 − x D) 24 − x E) 29 − x
The child's age today is 17 months + 12 months = 29 months   x months ago, the child's age was (29 - x) months old.   The answer is 29 − x.
<result>E</result>
If a young child was 17 months old one year ago, how old was the child, in months, x months ago?