Question

A number is four-fifths of the other. If their sum is 180, find the numbers.

Answer 1

720 I'm sure that's answer

Answer 2

100 and 80

Explanation:

let the numbers be n and
`(4)/(5)` n , then their sum is

n +
`(4)/(5)` n = 180 ( multiply through by 5 to clear the fraction )

5n + 4n = 900 , that is

9n = 900 ( divide both sides by 9 )

n = 100

and
`(4)/(5)` × 100 = 4 × 20 = 80

the numbers are 100 and 80