In an exam, the average marks obtained by the students was found to be 60. After

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In an exam, the average marks obtained by the students was found to be 60. After omission of computational errors, the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks. The total number of candidates who took the exam, was

Options:

A . 210

B . 200

C . 180

D . 240

Answer: Option B
Answer: (b)Let the number of candidates be x, then 60x – 45x = 30 × 100 ⇒ 15x = 3000 ⇒ x = 200

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