# math

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Sanjeev is twice as old as his son.If after four years he will be four times as old as his son was 9 years ago ,how old is each now ??

• math -

present:
son --- x
father --- 2x

in four years:
son x+4
father 2x+4

9 years ago:
son -- x-9
father -- 2x-9

2x+4 = 4(x-9)
2x+4 = 4x-36
-2x = -40
x=20

son is now 20 , and the father is now 40

check:
in 4 years:
son is 24
father is 44

9 years ago:
son was 11
father was 30

is 44 four times 11 ? YES

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