For a charity fund, out of 21 students, 20 deposited Rs.60 each. The 21st student spent Rs.15 more than the average expenditure of all the other. The total money deposited by all of them was (in Rs.)
1). 1265
2). 1275
3). 1280
4). 1290
We know that, Average of 20 students = (sum of n numbers)/n
∴ x = (20 × 60)/20 = Rs60
Amount deposited by 21st student = 60 + 15 = Rs. 75
The total money deposited by all of them = 60 × 20 + 75 = Rs. 1275