Question

What 2 numbers add up to 48 and the ratio is 1to3

Answer 1

12 and 36 the trick is to add up both ratios (3+1) then divide that by 48

Answer 2

let's assume those numbers are a and b.
a + b = 48

a/b = 1/3
3a = b

a + b = 48
a + 3a = 48
4a = 48
a = 12

b = 36