Question : The average of six numbers is 20. If one number is removed, the average becomes 15, what is the number removed?

Option 1: 5

Option 2: 35

Option 3: 112

Option 4: 45

Question : The average of the first three numbers is double the fourth number. If the average of all the four numbers is 12. Find the 4th number.

Option 1: $16$

Option 2: $\frac{48}{7}$

Option 3: $20$

Option 4: $\frac{18}{7}$

Question : The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and the average of the last 8 numbers is 8.5, then the middle number is:

Option 1: 10

Option 2: 23

Option 3: 13

Option 4: 15

Question : The average of two numbers is 8, and the average of the other three numbers is 3. The average of the five numbers is:

Option 1: 2

Option 2: 3

Option 3: 5

Option 4: 6

Question : The average of two numbers is 8, and the average of the other three numbers is 3. The average of the five numbers is:

Option 1: 2

Option 2: 3

Option 3: 5

Option 4: 6