posted by Delson .
In a class of 100 students, 40 offer Biology and 10 offer Chemistry and Biology .10 offer Physics and Chemistry , and 30 offer Physic and Biology . Each student offer at least one of the three subjects. The number of students who offer Biology is equal to those who offer Physics only and the sum of the number of students who offer Biology and those who offer Chemistry is equal to the number of students who offer Physics.
(a) illustrate the information on a Venn diagram
(b)find the number of students who offer
(I) Chemistry only
(II)only two subjects
(III)only one subject
(VI)Chemistry and Physics only
i.20 ii.70 iii.20 iv.70