In a class consisting of 100 students 20 know English and 20 do not know Hindi and 10 know neither English nor Hindi. How many students know both Hindi and English?
No. of students know both English and Hindi = x
No. of students know English (only) = 20-x
No. of students know Hindi (only) = 80-x
20-x + 80-x + x = 100 - 10
=> x = 10
So the number of students know both English and Hindi are 10
English (E) = 20
Hindi (H) = 100 -20 =80
100-H-E+(EH) = 10
And the answer is 50 students
10 neither hindi or english=100
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