A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is

Virat Bhati • 7.23K Points
Tutor III Math

Q. A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is

(A) 45

(B) 40

(D) 37

Correct Answer - Option(B)

Explanation by: Virat Bhati

Let there be x pupils in the class.
Total increase in marks = (x * 1/2) = x/2.
x/2 = (83 - 63) => x/2 = 20 => x = 40.

You must be Logged in to update hint/solution

Previous MCQ Next MCQ

Discusssion

Related MCQs on Math

Q. The product of two numbers is 9375 and the quotient, when the larger one is divided by the smaller, ...

Q. The difference b/w the compound interest payble half yearly and the simple interest on a certain sum...

Q. The present age of Sanyal is 3 times the present age of his son. Six years hence, the ratio of their...

Q. A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/3 hours to fill the ta...

Q. A cricketer scored some runs in his 21st innings, as a result, his average runs increased by 3. If t...

Q. How much does a watch lose per day, if its hands coincide every 64 minutes?

Q. Ramesh borrowed Rs. 3600 at a certain rate of interest C.I. and the sum grows to Rs. 4624 in 2 years...

Q. The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 i...

Q. To gain 10% on selling sample of milk at the cost price of pure milk, the quantity of water to be mi...

Q. A person sold a scooter at a profit of 10%. If he had sold it for Rs. 3000 more, he would have gaine...

Learn All Math MCQs

Download our easy to use, user friendly Android App from Play Store. And learn MCQs with one click.