Question : The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18. Then the 13th result is:

Option 1: 100

Option 2: 101

Option 3: 104

Option 4: 103

Question : The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18. Then, the 13^th result is: 

Option 1: 100

Option 2: 101

Option 3: 104

Option 4: 103

Question : Arrange the given ratios in descending order
15 : 7, 5 : 11, and 21 : 77.

Option 1: 21 : 77 > 5 : 11 > 15 : 7

Option 2: 15 : 7 > 5 : 11 > 21 : 77

Option 3: 15 : 7 > 21 : 77 > 5 : 11

Option 4: 5 : 11 > 15 : 7 > 21 : 77

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 : Three boys, on average, are 25 years old, and their ages are in the ratio of 3 : 5 : 7. What is the age of the youngest boy?

Option 1: 24 years

Option 2: 21 years

Option 3: 12 years

Option 4: 15 years