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(x1+x2)/2 =6
(x1+x2) =6*2

(x1+x2+x3)/3 =7
x1+x2+x3 =7*3
x1+x2+x3 =21
we know that value of x1+x2,
(x1+x2)+x3 =21
12+x3 =21
ie, x3 = 21-12 =9//
therefore the value of x3 is 9.
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Answer is 9 you can solve it very easily if u know the formula of mean .PLZ STUDY HARD as ur xams might be starting in march nd u still not clear with the concept of mean ,median and mode
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