Relax

Respuesta :

Answer: 30

Step-by-step explanation:

 40% = 12  |  40% + 40% = 80%  |   80% = 24  |  12 / 2 = 6  |  6 = 20%  | 40% + 40% + 20% = 30 questions

Please note that i'm not a professor and i might have this wrong.