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A whale has 15 meters of length. Her head is as big as her tail. If her head was two times longer than it actually is, her head and her tail, together, would be as long as the rest of her body (i.e., the part that is between the head and the tail). What is the length of her head, tail and the rest of the body?

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closed as off-topic by Gareth McCaughan, Marius, Dan Russell, Mike Earnest, JonMark Perry Jul 20 '16 at 23:42

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is off-topic as it appears to be a mathematics problem, as opposed to a mathematical puzzle. For more info, see "Are math-textbook-style problems on topic?" on meta." – Gareth McCaughan, Marius, Dan Russell, Mike Earnest, JonMark Perry
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This isn't really a puzzle, but:

Let H,B be the lengths of the head and body. The tail is of length H. If the head were twice as long then head+tail would be 3H, so B=3H. So total length is H+3H+H=5H and H=3m; the tail is the same length and the body is (as stated above) 3H = 9m.

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