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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?
comment deleted by its author
Bob is 36 years
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!
Bob is 12 years old.
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