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Question:

Of 1,000 dogs, 72% are male. Among the males, 3 out of 5 were over the age 5. How many of the dogs were males over the age of 5?

A 432
explanation

First multiply 1000 × 72% = 720 to find out how many dogs are male. This results in 720 male dogs of which 3/5 are over the age of 5. Therefore \(720 \times \frac{\mathrm{3} }{\mathrm{5} } = 432\)