We tested the air in your classroom and found 7 different kinds of mould. The cleaner says that it takes 5 days for each mould to be removed. If the school had to remove each mould one at a time, how long would it take to remove all the mould?
Answer: 35 days
How I worked it out: Because it said that it took 5 days for each mold, and there were 7 types of mould, I timed the 5 by 7, and the result was 35.
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