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September 1, 2014

September 1, 2014

Posted by **adis** on Thursday, December 27, 2012 at 10:22am.

- maths -
**Steve**, Thursday, December 27, 2012 at 10:38amf = 3s

3s+10 = 2(s+10)

s = 10

f = 30

check: in 10 years, 40 = 2*20

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