Question

Finf the med15 no are arranged in random order.The average of the 15 no is 54. The average of first 8 no is 64 and average of the last 8 no is 60. Find the 8th number

Answer 1

Answer:

15*54=810

8*64=512

8*60=480

512+480=992

992/16=32

8th no is 32

Answer 2

Answer:

Step-by-step explanation:

Average of 15 no. = 54

Sum of 15 no. = 54 × 15 = 810

Average of first 8 no. = 64

Sum of first 8 no. = 64 × 8 = 512

similarly

Sum of last 8 no. =480

Since 8th no. is common in both (from 1st 8 and last 8)

so,

8th no. = 512 + 480 - 810

            = 992 - 810

            = 182