Question 431459
Let J = John's age
Let M = Mary's age
Given:
J = 3M
J - M = 24
Substitute the value for J in the 2nd equation:
3M - M = 24
Solving for M gives M = 12
Therefore J = 3*12 = 36
Ans: John = 36 yrs old, Mary = 12 yrs old