Elitmus Exam Numerical Ability Alligation or Mixture

Given w,xx,y,z are positive number such as 1

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Elitmus Other Question

In a school 10% students get 70 marks,25% students get 80 marks,20% students get 85 marks,25% students get 90 marks,reemaing get 95 marks.the average of students marks is even number then least number of students?
a)20
b)80
c)100
d)200
In a swimming pool two swim in opposite direction there first meeting is 50m long from east of swimming pool and second meeting is 30m long from west of swimming pool then length of swimming pool?