In a class of 100 students, one fifth of the students dont have any of three - pen , pencil or paper. The number of students who have a pen and paper only, a pen and pencil only, a pencil and paper only are in the ration 1:2:3. 30 students dont have either pencil or paper. 40 students dont have either a pen or paper, 35 students dont have either a pen or a pencil. The number of students having pen and pencil only is double the number having all 3.
The number of student having a pen is?

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@perl Please help?

number of people who have
no pen & no pencil & no paper = 1/5 * 100 = 20

The way to usually solve this is with a Venn diagram

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