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Find x if the average of 20, 20, 19, 13, and x is 15
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Find x if the average of 20, 20, 19, 13, and x is 15

User James Caccese
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(20+20+19+13+x)/5=15
add in parenthesis and multiply 5 to both sides
(72+x)/5 [×5]=15 [×5]
(72+x)=75
subtract 72 from both sides
x=3
User Eduardo Moniz
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