Question 1181134
 (x+5),Jo' age
 (2x-4), Ben's age
and (7x+3) Harry's age 

 Harry is 42 years older than Jo and Ben together.

7x +3 = 42+ x+5 +2x-4
simplify

4x = 40

x=10

Plug the value of x in their ages 
Joe x+5 =15 years

Ben (2x-4) = 16 years

Harry's age = 73 years