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Q.

What is the total number of candidates at an examination, if 31 ¾ fail, and the number of those who pass exceeds the number of those who fail by 247?

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a

605

b

560

c

650

d

1,650

answer is C.

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Detailed Solution

Let the total number of candidates = x Thea. number of passed candidates

=(100-31 )% of x = 69 % of x

Now. 69 % of x-31 % of x = 247  38 % of x = 247

 38100x=247x=247×10038=650

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What is the total number of candidates at an examination, if 31 ¾ fail, and the number of those who pass exceeds the number of those who fail by 247?