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3 Cards in this Set
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- Back
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The average of A and B is 9 and the average of A,B and is C is 12. What dose C equal?
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Average=sum of all value/number of value
9=a+b/2 a+b=18 |
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Now, use the average formula to find A+b+C
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12=a+b+c/3
= a+b+c=36 |
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Sine you have found the value of A+b, put that value into the equation to find C
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a+b+c=36
18+c=36 C=18 |
