Question

one number is 3 times another number .If 15 is added to both numbers ,then one of the new number becomes twice that of the other new number .Find the number

Answer 1

let the two numbers be x& y

x=3y ----eqn 1

x+15=z

3y+15=z

y+15=w

z=2w

3y+15=2(y+15)

3y+15=2y+30

3y-2y=30-15

y=15

putting the value of y in eqn 1

we get x=45