Home
Class 14
MATHS
The average of 30 numbers is 12 . The a...

The average of 30 numbers is 12 . The average of the first 20 of them is 11 and that of the next 9 is 10 . The last number is

A

60

B

45

C

40

D

50

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

The average of 20 numbers is 12 . The average of the first 12 numbers is 11 and that of the next 7 numbers is 10 . The last number is

The average of eleven numbers is 68. The average of the first four numbers is 78 and that of the next four is 63. The 9^(th) number is two times the 11^(th) number and the 10^(th) number is half of the 11^(th) number. What is the average of the 9^(th) and 11^(th) numbers ?

The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three numbers is 74. The 8^(th) number is 6 more than the 9^(th) number and 12 more than the 10^(th) number. What is the average of the 8^(th) and 9^(th) numbers?

The average of 13 numbers is 65. The average of first three numbers is 63 and that of next numbers is 64.5. The 11^(th) number is 2 more than the 12^(th) number but less than the 13^(th) by 2.5. What is the average of 11^(th) and 12^(th) number?

The average of three numbers is 6. The average of the first two is 5 while the average of the last two is 8. The three numbers are: