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13-09-2018
Mathematics

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What number must be added to 15 -6 and 12 to have a mean of five

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eqcheng eqcheng

13-09-2018

-1 must be added.

15+(-6)+12=21. If you add one more number, then you would have to divide the sum by 4 to get the mean. 5*4=20. To get to 20, you have to add -1.

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