Question

The average of 11 numbers is 30. If
the average of first six numbers is
17.5 and that of last six is 42.5, then
what is the sixth number?​

Answer 1

Step-by-step explanation:

Sum of 11 Number is 11 x 30 = 330

Given :

[ Avg of first 6 numbers is 17.5, so Sum of first Six Number is 6 x 17.5 ]

[ Avg of Last 6 numbers is 42.5, so Sum of last Six Number is 6 x 42.5 ]

6th Number : ( Sum of first Six Number + Sum of last Six Number ) - 330

Hence the 6th Number is 30

Answer 2

Answer:

the six term is 30

Step-by-step explanation:

average of 11 numbers = 30

sum of 11 numbers = 30*11 = 330

average of first 6 numbers = 17.5

sum of first 6 numbers = 17.5*6 = 105

sum of last 6 numbers = 42.5

average of last 6 numbers = 42.5*6 = 255

sum of first 6 + last 6 numbers = 255+105 = 360

but 6th term is added 2 times 360–330 = 6th term