One number is 1/5 of another number. The sum of the two numbers is 18. Find the two numbers.

One number is 1/5 of another number. The sum of the two numbers is 18. Find the two numbers.

Let the two numbers be x and y. We're given:

1. x = 1/5y
2. x + y = 18

Substitute (1) into (2):
1/5y + y = 18

1/5 = 0.2, so we have:
1.2y = 18

Type 1.2y = 18 into the search engine, and we get y = 15.
Which means from equation (1) that:
x = 15/5
x = 3

Our final answer is (x, y) = (3, 15)