lemleys3 lemleys3

03-01-2016
Mathematics

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Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number?

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louis22lomboyScarf louis22lomboyScarf

03-01-2016

The fourth number is 10
a+b+c=22
22+d/4 = 8
multiply both by 4
22+d = 32
32-22 = 10
d = 10

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