In a class 48% students failed in maths 32% failed in chemistry 20% failed in both subjects if the number of students who passed the both was 840 how many students were there in the class

a: 1800
b: 2100
c: 2000
d: 2200

• solve it using venn diagram......
  (48%+32%)-20%=60% fail.
  we have given the value of pass in both subjects , then
  if 60% fail then remaining 40% pass ....
  
  40% of x=840
  840*100/40= 2100 ans
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• 2100
  where x is total no. of students
  (48x/100)+(32x/100)-(20x/100)+840=x
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