The average marks obtained by 100 candidates in an examination is 50; the average marks of candidates who passed is 60 and that of the failed candidates is 20. How many candidates have passed in the examination? Select one: a. 50 b. 75 c. 60 d. 25
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Average of 100 people is 50
So sum of all their mark is 50x100=5000
Let m be the no passed
Then 100-m be the no failed
So 60m + (100-m)20=5000
40m = 3000
m = 75
So sum of all their mark is 50x100=5000
Let m be the no passed
Then 100-m be the no failed
So 60m + (100-m)20=5000
40m = 3000
m = 75
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