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# A book has 12 chapters about flying birds, 5 chapters about flying insects, 4 chapters about land insects, and 4 chapters about land mammals. If the probability of picking a chapter about certain types of animals is $\frac{8}{25}$, what type of animal is the chapter about?

Solution

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Since there are 4 chapters each for land insects and land mammals, then the probability that a chosen chapter is about land insects or land mammals is $\dfrac{4+4}{25}$ or $\dfrac{8}{25}$. This confirms the conditions of the problem.

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