The average of 5 numbers is 15. Find a number which should be included in these numbers to make the average 16.
Answer & explanation
Correct answer: option 3
Average of 5 numbers = 15
Sum of 5 numbers = Average of numbers × Total numbers
= 15 × 5
= 75
After adding a new number A, new average is 16.
Sum of 6 numbers = 16 × 6 = 96
According to question ,
75 + A = 96
A = 21