Question 1049892
Let x be Jill's age NOW.  Jack (x+10)
in 3 years...
(x+10) + 3 = 3(x+3)
 x+10 + 3 = 3x+9
4 = 2x
x = 2, Jill's age now. Jack is 12
AND Checking
in 3 years...
15 = 3*5 CHECKS!