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
Answers
Answered by
1
Answer:
may be 40
YOU HOPE IT WILL HELP YOU
MARK ME AS A BRAINLIST.
Answered by
1
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
Similar questions