Answers

2016-02-25T19:42:21+08:00
John is three times as old as his nephew, Pete. Four years ago, he was four time as old as Pete. How old is Pete?
let x = Pete's age (current)
3x = John's age (current)
x - 4 = Pete's age (four years ago)
4(x - 4) = John's age (four years ago)

4(x - 4) = 3x - 4
4x - 16 = 3x - 4
4x - 3x = -4 + 16
x = 12 - Pete's age

Please, kindly correct me if I'm wrong. ^-^
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