in a class of 50 student the number of student who offer history is twice the number who offer economics. 10 students offer neither of the two subject and 5 student offer both subjects. i. how many students offer history ii. illustrate the information in a venn diagram
If x do econ, then
2x + x - 5 = 50-10
x = 15
so 30 do history
review Venn diagrams, so you can do yours