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The sum of three numbers is 66 . The second number is 2 times the third. The third number is 6 less than the first. What are the numbers?

Soluzione

The sum of three numbers is 66 . The second number is 2 times the third. The third number is 6 less than the first. What are the numbers?

Soluzione

The numbers : 21, 30, 15

Fasi della soluzione

Represent the numbers with

x, y, z

:

number 1 : x

number 2 : y

number 3 : z

A.T.Q.:

x + y + z = 66

y = 2 z

z = x - 6

x + y + z = 66, y = 2 z, z = x - 6 : x = 21, y = 30, z = 15

The numbers : 21, 30, 15

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