Question 321527
let him invest x at 7%
hw will invest 2x at 9%
..
Interest equation
0.07x+0.09x=1250
multiply by 100
7x+9x=125000
16x=125000
x=125000/16
=7812.50 at 7% 
..
2x= 2*7812.50
=15625.00 at 9%