in a class of 50 students the number of students who have the accountant is twice the number who offer economics I illustrate the information on a venn diagram II how many students offer accounting III how many students offer economics IV how many students offer only one subject.

Answer 1

ever hear of newlines to make things clearer?
A+E-(A&E) = 50
Since A=2E, that means
3E-(A&E) = 50
Without knowing how many take both (and, how many take neither!), there is no way to assign numbers.

Answer 2

in a class of 32 students, 18 offer chemistry, 16 offer physics and 22 offer mathematics, 6 offer all the three subject, 3 offer chemistry and physics only and 5 offer physics only.each student offers at least one subject. find number of students who offer

Answer 3

2x - 5