jane paid $40 for an item after she received a 20% discount. jane's friend says this means that the original price of the item was $48.aHow do you think jane's friend arrived at this amount?

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If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?