The average of four numbers is 16. If three of them are 15, 18, and 20, find the fourth number.
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Answer:
Let the fourth number be x
so (15+18+20+x)/4=16
53+x/4=16
53 +x = 16*4
53 + x = 64
x = 64 - 53
x = 11 is the right answer.
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