in a certain examination,52 candidates offers biology, 60 offers history, 92 offers both biology and history,21 offers both biology and history, 22 mathematics and history. If 7 candidates offers all the three subjects

Question

find
a.how many candidate who where there for the examination
b.how many candidate offer one subject only
c.how Many offers two subjects only
d.how many offers at least two subjects

Answer 1

Make up your mind:

92 offers both biology and history,21 offers both biology and history

Answer 2

I've seen this incorrect wording before. The word "offer" is not used correctly here. You mean "take" or "took."

In a certain examination, 52 candidates took biology, 60 took history, 92 took both biology and history …

I'm hoping "Favour" will point this error out to his/her instructor so better textbooks will be chosen and better teaching will happen.