The average of 24 numbers is 65. The average of first 11 numbers is 67 and the average of last 10 numbersis 70.If the 12th number is 13 less than the 13th number, and the 14th number is one more than the 13th number, then the average of 12th and 14th number is:
Answers
Answered by
0
Step-by-step explanation:
total = 24* 65
= 1560
first 11 numbers
total = 11* 67
= 737
last 10 number
total = 10*70
= 700
12th 13th 14th number
total = 1560 - 1437
= 123
let 13th number is x.
then
12tn number = x -13
14th number = x +1
so
( x-13) + x + (x+1) = 123
3x -12= 123
3x = 135
x = 45
hence
12Th number = 45 - 13 = 32
13th number = 45
14th number = 45 + 1 = 46
Similar questions