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受欢迎的 Word Problems >

The sum of three numbers is 66 . The second number is 3 times the third. The first number is 9 less than the third. What are the numbers?

解答

T h e s u m o f t h ree n u mb ers i s 66 . T h e seco n d n u mb er i s 3 t im es t h e t hi r d . T h e f i rs t n u mb er i s 9 l ess t han t h e t hi r d . Wha t a re t h e n u mb ers ?

解答

The numbers : 6, 45, 15

求解步骤

Represent the numbers with

x, y, z

:

number 1 : x

number 2 : y

number 3 : z

A.T.Q.:

x + y + z = 66

y = 3 z

x = z - 9

x + y + z = 66, y = 3 z, x = z - 9 : x = 6, y = 45, z = 15

The numbers : 6, 45, 15

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