The average of 10 numbers is ---10. If the sum of 6 of them is 100, then what is the average of the other 4 numbers ?
A
-100
B
-50
C
50
D
100
Correct Answer: -50
Total of 10 numbers = - 10×10 = - 100 the sum of 6 numbers is 100 so,Sum of last 4 numbers = - 100 - 100 = - 200 ∴Average = - 200/4 = - 50 (ans)