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snow_lady [41]
3 years ago
6

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

Mathematics
1 answer:
lys-0071 [83]3 years ago
6 0
(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
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