The average of 3 numbers is 7. two of the numbers are 8 and 9. what is the third?
2 answers:
Make an equation. x will be the third number.
To find the average, you add up the numbers then divide the sum by the number of numbers you added up.
(8 + 9 + x) ÷ 3 = 7
Now solve. Add up like terms (8 + 9).
(17 + x) ÷ 3 = 7
Multiply both sides by 3.
17 + x = 21
Subtract both sides by 17.
x = 4
The third number is 4.
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i will answer -- justv please clarify ur question
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We need to solve both for y.
<u>#9:</u>
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