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Answer:
Step-by-step explanation:
Given
--- Average
--- Average
Required
Determine the overall average
Represent the sum of the first three with x.
So:
Solve for x
Represent the sum of the next seven with y.
So:
Solve for y
The overall average is calculated as thus:
Answer:
a. n=8
Step-by-step explanation:
to solve an equation, we must do the same operations to both sides.
step 1- add 8 to both sides. now n/4-8=-6 becomes n/4=2
step 2- multiply both sides by 4. so n/4=2 becomes n=8, which gives us our answer.