Question

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​

Answer 1

Answer:

may be 40

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Answer 2

Answer:

(a)  25

Step-by-step explanation:

a + b + c + d + e + f = 180   .......... Given, if average=30 Total=30x6=180

a + b + c + d = 100 ...... Eq 1  (Avg of first 4= 25, therefore Total=25x4=100)

d + e + f = 105 ...... Eq 2  (Avg of last 3= 35, therefore Total=35x3=105)

a + b + c + d + d + e + f = 100+105= 205  ..... (Add Eq 1 and Eq 2)

(a + b + c + d + e + f) + d = 205

180 + d = 205

d = 205-180 = 25