The average of 6 numbers is 45. The average of the first four numbers is 40, and the fifth number is 50. What is the sixth number?
Show answer & explanation
Correct answer: C
Explanation
Total sum of 6 numbers = 6 × 45= 270
Sum of the first 4 numbers = 4 × 40= 160
Fifth number = 50
Sixth number = 270 − (160 + 50)= 60