A zookeeper was asked how many animals are there in the zoo. He replied that there are all lions but 5, all monkeys but 7, and all elephants but 4. How many animals are there?
Explanation:
Let total number of animals is T.
There are all lions but 5 - means that except for 5 animals all other are lions.
∴ Lions = T – 5 …(1)
All monkeys but 7 – means except for 7 animals all other are monkeys.
∴ Monkey = T - 7 …(2)
All elephant but 4 – means except for 4 animals all other are elephants.
∴ Elephants = T – 4 …(3)
Adding all three equations, we get
Lions + Monkeys + Elephants = 3T – 16
⇒ T = 3T – 16
⇒ T = 8.
Hence, option (b).
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