Question

1. The average of 9 numbers is 30. The average of first 5 numbers is 25 and that of the last3 numbers is 35. What is the 6th number?
(a) 20
(b) 30
(c) 40
(d) 50​

Answer 1

Answer:

answer is c 40 hope it is not too good

Answer 2

let, sum of nine num. is x

avg of 9 num x÷9=30

then x=270

similarly sum of 5 num. is y

then y=125

and sumof last three num is z

z =105

A+y+z=x

then z =40