Find the average of the the first 15 multiples of 5.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 40.
The first 15 multiples of 5 = 5, 10, 15, 20, ..., 75
First term = 5
Last term = 75
Number of terms = 15
Average = (First term + Last term) ÷ 2
Average = (5 + 75) ÷ 2 = 80 ÷ 2 = 40