If the average of the numbers 5, 7, 9, 12, 13, t, 20 is t, then what is the value of t?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 11
Average = sum of the numbers/total numbers
t = (5 + 7 + 9 + 12 + 13 + t + 20)/7
7t = 66 + t
t = 66/6 = 11