Question 411032
Let:
Leah = 6+x
Sue = x
John = 5+(6+x)
Total sum = 41 

6+x+x+5+6+x=41
3x+17=41

3x=24
x=8 

8+6=14
14+5=19 

Sue is 8 years old 
Leah is 14 years old 
John is 19 years old.