Verified Answer :

apologiabiology

average is the sum divideided by the number of numbers added together

so avarage of 3 number is 15 means
three numbers represented as x+y+z so
\(\frac{x+y+z}{3}\) = 15
(x+y+z)/3=15
multiply both sides by 3 to clear fraction
x+y+z=45
45 is the sum of the 3 numbesr
double of that is
45 times 2=90

AL2006

If three numbers average 15, then their sum is 45. Two times 45 is 90.

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