50 students in a
class room likes nepali history or both subjects. Out of them 20 like both
subjets. If the ratio of the

1 thought on “50 students in a<br />class room likes nepali history or both subjects. Out of them 20 like both<br />subjets. If the ratio of the”

1. Answer:

   n(M) = 3x

   n(S)= 2x

   n (M∩S) = 20

   By using formula,

   n(M∪S) = n(M) +n(S) – n(M∩S) or, 50=3x+2x-20

   or, 50 = 5x-20 or, 5x=70

   x=14

   ∴Number of students who like Mathematics = 3x = 3×14 = 42

   Reply