By Ajay Kumar

Verified by Ajay Kumar

The average marks of 30 students is 55. If one student who scored 40 is replaced by another who scored 70, what will be the new average?

  1. 56

  2. 58

  3. 60

  4. 62

Answer: A

Solution

Original total marks \(=30\times55=1650\). The increase in total marks is \(70-40=30\). New total marks \(=1650+30=1680\). New average \(=1680/30=56\). Trick: New average \(=\) old average \(+\frac{\text{difference in marks}}{\text{number of students}}=55+\frac{30}{30}=56\).

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