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?

Question

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?

anonymous · Answer

@perl Please help?

perl · Answer

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

perl · Answer

The way to usually solve this is with a Venn diagram