Question

If the sum of 8 numbers is 80 then find their mean.

Answer 1

Step-by-step explanation:

4 times a sum means that 4 must go outside of parentheses with the sum inside.

4(8 + x) = 80

Distribution property

32 + 4x = 80

subtract 32 from both sides

32 - 32 + 4x = 80 - 32

4x = 48

Divide both sides by 4

x = 12

Check

8 + 12 = 20 is the sum

4 x 20 = 80 4 times the sum

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