Question

In a class of 45 students,30 read biology and 25 read chemistry. Each student reads at least one of the two subject
(i)illustrate this information on a venn diagram.
(ii) How many students read both subject
(iii) How many students read only chemistry
(iv) How many students read only one subject

Answer 1

(ii) 30+25-x = 40
Now make your Venn diagram, and the rest is easy

Answer 2

let B equal both

(ii) 30 + 25 - B = 45

(iii) 25 - B

(iv) 45 - B