Question

18. Out of 12 terms, the average of first 6 terms is
36 and that of last 6 terms is 40. If the average
of first 11 terms is 37, find the 12th term.
(a) 47
(b) 51
(C) 45
(d) 49
(C) None of these
T​

Answer 1

Answer:

Mean of 11 number=35

Sum of 11 number=35×11=385

Mean of first 6 number=32

Sum of 6 number=32×6=192

Mean of last 6 number=37

Sum of 6 number=37×6=222

∴ Sixth number=(192+222)−385

⇒414−385=29