Question 977534
3 years ago the son's age would 
have been 15 - 3 = 12 years old.
Therefore the person's age at 
that time (3 yrs ago)would be 48 (4 x 12)
At that time (3yrs ago) his wife's
age would have been 45 (48 - 3)
So his wife would be 50 in 5 years time.
Hope this helps:-)