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Popolare Word Problems >

The sum of three numbers is 99. The third number is 4 times the second. The second number is 9 more than the first. What are the numbers?

Soluzione

T h e s u m o f t h ree n u mb ers i s 99. T h e t hi r d n u mb er i s 4 t im es t h e seco n d . T h e seco n d n u mb er i s 9 m ore t han t h e f i rs t . Wha t a re t h e n u mb ers ?

Soluzione

The numbers : 9, 18, 72

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 = 99

z = 4 y

y = 9 + x

x + y + z = 99, z = 4 y, y = 9 + x : x = 9, y = 18, z = 72

The numbers : 9, 18, 72

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