Let x--------------> ages of Raj y--------------> age of Zia
we know that x=y+3-------------> equation 1 x²+y²=369-----------> equation 2
I substitute 1 in 2
(y+3)²+y²=369----------> y²+6y+9+y²=369---------> 2y²+6y-360=0 2y²+6y-360=0 using a graph tool-----------> to calculate the quadratic equation see the attached figure
the solution is y=12 x=y+3--------> x=12+3--------> x=15
the answer is Raj is 15 years old Zia is 12 years old
