Question

The sum of two numbers is 80. If one of four times the other, find the number.

Answer 1

Let the first number = x

then second number = 4x

according to question,

x + 4x = 80⇒ 5x = 80 ⇒ x = 16

so, first number = 16

and second number = 16 × 4 = 64