The average of five numbers is 66. If the average of first four numbers is 68, what is the value of the fifth number?
A66
B68
C60
D58
Answer:
D. 58
Read Explanation:
Sum of five numbers = 66 × 5 = 330
Average of first four numbers = 68
Sum of first four numbers = 68 × 4 = 272
Value of the fifth number = 330 – 272 = 58