Answers

2016-03-03T19:42:05+08:00
Let x be the son

Mr. Hernando: 4x while the son:x

In 10 years, Mr. Hernando: 4x +10

The solution is 4x + 10 = (x + 10) 2
4x + 10 = 2x + 20
Transpose.
4x - 2x = 20 - 10
2x = 10
Divide both sides by 2 to cancel the two in 2x.
x = 5

Son = 5
Mr. Hernando = 20
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2016-03-03T19:43:26+08:00