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

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

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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)
 
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