Question

In a group of 55 students 35 students like only subject out of english and science , the ratio of students who like both and who do not like both is 1:2. find students who like both subjects ?​

Answer 1

n(EnS)= 10

Explanation:

n(U)= 55

n(EnS)= x

n"(EuS)"= 2x

n(EuS)= 35

We have,

n"(EuS)"= n(U) - n(EuS)

=55-35

=20

n(EnS) /n"(EuS)" = 1/2

x/20 = 1/2

2x=20

x=20/2

x=10

Therefore, n(EnS) = 10