In a house, there are 16 cats. Two of them are white, and 25% of them are black. The rest of the cats are grey. How many grey cats are in this house?
Let's be accurate as possible and think first.
10
In this house, there are 16 * 25 / 100 = 4 black cats.

If there are two white cats, that means that there are 16 - 4 - 2 = 10 grey cats in this house.

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So, the answer is 10