Question

The sum of two number is 45 and their ratio is 7:8. Find the number

Answer 1

let the 2 no.s be 7x and 8x....
so, 7x+8x=45
15x=45
and,x=45/15
x=3

Answer 2

let the numbers be x and y
x+y=45
7k+8k=45
15k=45
k=3
x=7*3=21
y=8*3=24