Question

If the sum of two numbers is 24 and their difference is 15. What is the positive difference of the two numbers??

Answer 1

let the numbers be x and y

X+y=24---------------@----eq. 1

Difference=15

X-y=15-----------------@----eq. 2

By elimination method

X+y=24

X-y=15

+y and -y will be cancled

And x and x will be added

Therefor,2x=39

X=39/2

Putting value of x in eqn.1 and find value of y