the mean of a, b,c is 10 and the mean of a and b is 12.
find the value of c.
F.3MATHS -- MEAN* : ]
2006-12-26 9:24 pm
回答 (1)
2006-12-26 9:30 pm
✔ 最佳答案
(a+b+c)/3 = 10a+b+c = 30 --- [1]
(a+b)/2 = 12
a+b = 24 --- [2]
Sub [2] into [1]
24+c = 30
So, c = 6
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