Question

in examination 125 student passed an 85 student fails how many student appeared in the examination
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Answer 1

Answer:

80 % passed in sub

85 % passed in maths

75 % passed in both

And 45 students failed in both.

So, let there are X no of students.

80% of X passed in sub = (80/100)*x =4x/5.

85% of X passed in maths=(85/100)*x=17x/20.

75% of X passed in both =(75/100)*x= 3x/4.

There students passed “only” in sub = students passed in sub - students passed in both

i.e 4x/5 - 3x/4 = x/20 .

Similarly, students passed only in maths

= 17x/20 - 3x/4 = x/10 .

There for total students passed = 3x/4 + x/20 + x/10 = 18x/20 = 9x/10 .

There for no of students failed = x - 9x/10 = x/10

And x/10 = 45 ( given in question)

So X = 450 .

There total students in class is 450 .

Note : X =x.

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Answer 2

Answer:

125 +85 =210

no of Stu = no of Stu passed + no of Stu failed