Question

In a school there are 240 students who study maths or physics ,80 study physics and 20 study both maths and physics,how many study maths?

Answer 1

Answer:160

Step-by-step explanation:

20+(240-20-80)

Answer 2

Answer:. 180

total n(MUP) =240

Total physics = 80

(maths + physics) i. e. n(M∩P)=20

therefore , (only physics) n(P) = 80 - 20 = 60

now , only mathematics

n(M) = n(MUP) - [ n(M∩P) + n(P) ]

n(M) = 240 - [20 + 60]

n(M) = 240 - 80

n(M) = 160 ---------------eq 1

Hence , total mathematics students = eq 1 + n(M∩P)

Therefore , Total mathematics students = 160 + 20 --> 180