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Let's have another math question. The first person to answer it correctly will receive 0.00001000 BTC.

Bob's father is 3 times as old as Bob. Four years ago he was 4 times older. How old is Bob?

If Bob is 36, then his father is 108. Four years ago his father was 104 and Bob was 32, which is NOT 4 times more. So, the answer is wrong. Still waiting for the correct one!

181222: Correct answer! I have just sent BTC to your account. Thanks you all for participation.

If you do not know how to solve this kind of questions, take a look at the solution on this page: https://www.cut-the-knot.org/Outline/Algebra/TypicalAgeProblem.shtml

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