9. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is: 31 kg
10. When a number is added to two-thirds of itself, the result is 45. What is the number? 27
11. When a number is added to a number three times as large, the result is 16. What is the number? 4
12. The product is a2b3 and a3b6 is: a5b9
13. The number midway between 103 and 301 is: 202
14. If x = 1, then x9 = ? 1
15. If 4x – 6 = 2x + 8, then x? 7
16. In a continued proportion a : b = b : c, c is called: Third proportion