The average of 11 consecutive integers is 12. Then, 9 is deducted from the first consecutive
number, 8 is deducted from the second, 7 is deducted from the third, and so on until the
last number which remains unchanged. What is the new average?
A)55
B)50
C)6
D)7.5
E)8.7
Answer E
I did this:
Total original sum = 11 * 12 = 132
Deduction = 0+ 1 + ...+ 9 = average * total numbers = 4.5 * 10 = 45
132 - 45 = 87
87/11 = 7.9 something
That option is not available.
Where did I go wrong?
Thanks!
number, 8 is deducted from the second, 7 is deducted from the third, and so on until the
last number which remains unchanged. What is the new average?
A)55
B)50
C)6
D)7.5
E)8.7
Answer E
I did this:
Total original sum = 11 * 12 = 132
Deduction = 0+ 1 + ...+ 9 = average * total numbers = 4.5 * 10 = 45
132 - 45 = 87
87/11 = 7.9 something
That option is not available.
Where did I go wrong?
Thanks!
