Latest exam Aptitude Question SOLUTION: 6. 20x + 3y= 20 -20x + 5y= 60 9. 3x - 10y= -25 4x + 40y= 20 10. 7x + 15y= 32 x - 3y= 20 11. x - 8y= 18 -16 + 16y= -8 12. 24x + 2y= 52 6x - 3y= -36