(a) 21

(b) 12

**(c) 15**

(d) 18

(e) None of these

**Q2. The average of first ten prime numbers is:**

(a) 10.1

(b) 10

**(c) 12.9**

(d) 13

(e) None of these

**Q3. The average of first three numbers is double of the fourth number. If the average of all the four numbers is 12. Find the 4th number.**

(a) 16

**(b) 48/7**

(c) 20

(d) 18/7

(e) None of these

**Q4. Find the average of cubes of first 49 positive integers.**

**(a) 30625**

(b) 1225

(c) 30125

(d) 6235

(e) None of these

**Q5. What is the arithmetic mean of first 20 odd natural numbers:**

(a) 19

(b) 22

**(c) 20**

(d) 17

(e) None of these

**Q6. The average of three numbers is 135. The largest number is 195 and the difference between the other two is 20. The smallest number is:**

(a) 65

**(b) 95**

(c) 105

(d) 115

(e) None of these

**Q7. Sachin Tendulkar has a certain average for 11 innings. In the 12th innings he scores 120 runs and thereby increases his average by 5 runs. His new average is:**

(a) 60

(b) 62

**(c) 65**

(d) 66

(e) None of these

**Q8. The batting average for 30 innings of a cricket player is 40 runs. His highest score exceeds his lowest score by 100 runs. If these two innings are not included, the average of the remaining 28 innings is 38 runs. The lowest score of the players is:**

(a) 15

**(b) 18**

(c) 20

(d) 12

(e) None of these

**Q9. Six tables and twelve chairs were bought for Rs. 7,800. If the average price of a table is Rs. 750, then the average price of a chair would be:**

(a) Rs. 250

**(b) Rs. 275**

(c) Rs. 150

(d) Rs. 175

(e) None of these

**Q10. The average of 8 numbers is 27. If each of the numbers is multiplied by 8, find the average of new set of numbers.**

(a) 1128

(b) 938

(c) 316

**(d) 216**

(e) None of these