in a class of 50 students ,30 study biology and 25 study economics .15 study neither biology nor economics
a.how many take both subjects?
b.how many take only biology?
c.Ho many take economics only?
(50 - 15) study bio, eco, or both ... 35 students
30 study bio , so (35 - 30) study only eco
25 study eco , so (35 - 25) study only bio
15 study only one subject , so (35 - 15) study both
Show The workings
I did not see the Venn diagram and the workings
How did you get 35?
30-x+x+25-x=50
30+25-x-x+x=50
55-1x
-1x=50-55
X=-5รท-1
Minus will cancel minus
Therefore..x=5