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The Mean Problem

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2

four unknown numbers

There are four unknown numbers.

The mean of the first two numbers is 4, and the mean of the first three numbers is 9.

The mean of all four numbers is 15.

If one of the four numbers is 2, what are the others?


See all short problems arranged by curriculum topic in the short problems collection