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Phổ biến Word Problems >

If you double a number and then add 20 , you get 4/7 of the original number. What is the original number?

Lời Giải

I f yo u d o u b l e a n u mb er an d t h e n a dd 20, yo u g e t 4/7 o f t h e or i g ina l n u mb er . Wha t i s t h e or i g ina l n u mb er ?

Lời Giải

The number : - 14

Các bước giải pháp

Represent the number with

x

A.T.Q.:

2 x + 20 = \frac{4}{7} x

Giải

x, 2 x + 20 = \frac{4}{7} x : x = - 14

The number : - 14

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