Answer:
22 students
Step-by-step explanation:
0.65 - 0.3 = 0.35
0.35 - 0.15 = 0.2
0.35 + 0.2 = 0.55
0.3 + 0.15 = 0.45
0.55 prefer football.
0.55 × 40 = 22
