Seudónimo Seudónimo

11-05-2016
Mathematics

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Ethan is 40 years old. His son is 12 years old.

How many years ago was Ethan 5 times older than his son?

Respuesta :

pankake123 pankake123

11-05-2016

20 years in the future......

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wegorkie wegorkie

11-05-2016

40-x / 12-x = 5
40-x = 5 * (12-x)
40-x = 60 - 5*x
5*x-x = 60 - 40
4*x=20
x=5

It was 5 years ago. Ethan was 35 and son was 7.

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