Playing with Numbers

23. If 5 × A = CA then the values of A and C are

• (a) A = 5, C = 1
• (b) A = 4, C = 2
• (c) A = 5, C = 2
• (d) A = 2, C = 5

24. If 5A + 25 is equal to B2, then the value of A + B is

• (a) 15
• (b) 10
• (c) 8
• (d) 7

25. If AB × B = 9B, then

• (a) A = 1 and B = 5
• (b) A = 9 and B = 6
• (c) A = 1 and B = 6
• (d) A = 9 and B = 5

26. If 5A + B3 = 65, then the value of A and B is

• (a) A = 2, B = 3
• (b) A = 3, B = 2
• (c) A = 2, B = 1
• (d) A = 1, B = 2

27. If A3 + 8B = 150, then the value of A + B is

• (a) 13
• (b) 12
• (c) 17
• (d) 15

28. If 5A × A = 399, then the value of A is

• (a) 3
• (b) 6
• (c) 7
• (d) 9

29. If 6A × B = A8B, then the value of A – B is

• (a) –2
• (b) 2
• (c) –3
• (d) 3

30. If B × B = AB, then

• (a) A = 2 and B = 4
• (b) A = 3 and B = 5
• (c) A = 2 and B = 5
• (d) A = 3 and B = 6

31. If AB × 4 = 192, then A + B is equal to

• (a) 12
• (b) 13
• (c) 11
• (d) 14

32. If AB + 7C = 102, where B ≠ 0, C ≠ 0, then A + B + C is equal to

• (a) 12
• (b) 13
• (c) 14
• (d) 15