Answer 31,32,33,34,37,39,40,43,46,47 thanks

Answers
31. 9
6 + a a=3 6+3=9

32. 10
b•5 b=2 2•5=10

34. 9
27/a a=3 27/3= 9

35. 10
12-b b=2 12-2=10

37. 6
2a 2 x a a=3 2 x 3 =6

39. 5
a + b a=3 b=2 3+2=5

40. 15
C+a c=12 a=3 12+3=15

43. 4
C/a 12/3

46. 36
C(a) 12x3=36

47. ?

The answer would be option 4