The sum of three number is 80. The first number is 8 less than the second. The third number is 2 times the first. What are the numbers?

Answer 1

X + Y + Z = 80

X = Y - 8, so Y = X + 8

Z = 2X

Substitute the last 2 expressions for Y and Z in the 1st equation to get:

X + (X + 8) + 2X = 80

4X + 8 = 80

4X = 72

X = 18

From the other equations:

Y = X + 8 = 18 + 8 = 26

Z = 2*18 = 36