Question

find 2 numbers with sum is 75 and difference is 15?

Answer 1

Let the two numbers be x and y

x+y=75------1

x-y=15-----2

add both the equations together:

2x=90

x=45

Put the value of x in any one of the equation:

x+y=75

45+y=75

y=30

Therefore the two numbers re: 45 and 30

Hope it helps.....