Harvey is 3 times as old as Jane. The sum of their ages is 48 years. What are both their ages.
H+j= 48
3j+j=48
4j=48
J=48/4
Jane is 12 years old
and Harvey is 36 years old
Simple....
write into an equation...
3x+x=48
4x=48
x=12
See if it's true...
3*12=36
12
36+12=48
You know it's true...
Thus, your answer.