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Summer Clouds moderators

08/08/2017 at 08:49
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The average of a, b and c is 15. The average of a and b is 18. What is the value of c? 




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    Lê Quốc Trần Anh Coordinator 08/08/2017 at 08:53

    The sum of a,b,c is: \(15.3=45\)

    The sum of a,b is: \(18.2=36\)

    So the value of c is: \(45-36=9\)

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