Question

The average of 4 numbers is 16 and the average of another 4 numbers is 20. Find the average of the 8​

Answer 1

Answer:

Let the first 4 nos. be x, x1, x2, x3

ATQ,

x+x1+x2+x3/4 = 16

x+x1+x2+x3 = 64 ----(1)

Let the another 4 nos. be a, a1, a2, a3

ATQ,

a+a1+a2+a3/4 = 20

a+a1+a2+a3 = 80 ---(2)

Now,

a+a1+a2+a3+x+x1+x2+x3 /8 = 64+80/8

= 144/8 = 18