Question : The average of 19 numbers is 22.8. The average of the first ten numbers is 18.4 and that of the last ten numbers is 28.6. If the $10^{\text {th}}$ number is excluded from the given numbers, then what is the average of the remaining numbers? (Your answer should be nearest to an integer.)

Option 1: 21

Option 2: 23

Option 3: 22

Option 4: 20

Question : What is the average of the first 29 even numbers?

Option 1: 30

Option 2: 31

Option 3: 32

Option 4: 33

Question : What is the average of the first six prime numbers?

Option 1: $6 \frac{1}{3}$

Option 2: $6 \frac{5}{6}$

Option 3: $6 \frac{2}{3}$

Option 4: $6 \frac{1}{6}$

Question : Which one of the following is a factor of the sum of the first twenty-five natural numbers?

Option 1: 26

Option 2: 24

Option 3: 13

Option 4: 12

Question : The average of n numbers is 42. If 75% of the numbers are increased by 4 each and the remaining numbers are decreased by 8 each, then what is the average of the numbers, so obtained?

Option 1: 44

Option 2: 42.5

Option 3: 43

Option 4: 43.8