The average of 7 numbers is 50.The average of first three of them is 40, while the average of the last three is 60.
What must be the remaining number?
3
A. 65
B. 55
C. 50
D.45
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Answer:
Given, (a+b+c+d+e+f+g)/7= 50 which is eqn1. , (a+b+c)/3=40 which means a+b+c=120, and (e+f+g)/3=60 which means e+f+g=180. d+300=350 which implies d=50.30-Nov-2018
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