7. The average of six members is 30. If the
average of first-four is 25 and that of last
three is 35, then the fourth number is
(a) 25 (b) 30 (c) 35 (d) 40
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Answer:
The average of 6 number is 30
total is 60*3=180
then average of first 4 is 25.
total is 25*4=100
and average of last 3 is 35.
total is 35*3=105
So the 4th number is =(100+105)-180=25
Explanation:
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