Answer: 2 people
Step-by-step explanation:
Since 25 both do english and B.M, subtract 25 from any one of them
53 - 25 = 28
Now, add 28 it to the one that we didn't subtract, 50
28 + 50 = 78
Now, subtract the total, 80 from 78
80 - 78 = 2
∴ 2 people haven't done any tuition
