24 students collected money for donation The average contribution was Rs50 Later on their teacher al...........

Quantitative Aptitude (CGL) Average

24 students collected money for donation. The average contribution was Rs50. Later on, their teacher also contributed some

money. Now the average contribution is Rs56. The teacher’s contribution is:

This questions was previously asked in

SSC CGL 6th March 2020 Shift-2

Rs 56

Rs 200

Rs 106

Rs 194

- Initially, 24 students collect an average of Rs 50 each for the donation.

- Total collected by students is 24 * 50 = Rs 1200.

- The teacher joins the contribution, raising the average to Rs 56.

- Now, with the teacher, the total participants = 24 + 1 = 25.

- New total collection = 25 * 56 = Rs 1400.

- Teacher’s contribution is Rs 1400 - Rs 1200 = Rs 200.

- Option 1: Rs 56 - This is less than the new average, hence incorrect.

- Option 2: Rs 200 - Correct calculation, matches the contribution.

- Option 3: Rs 106 - Arbitrary number, less than correct amount.

- Option 4: Rs 194 - Close, but not the exact calculation.

- Correct Answer: Option 2: Rs 200

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