Average weight of 13 students in a class is 55 kg, out of which the average weight of the first 6 students is 53 kg and the average weight of next 6 students out of the remaining 7 is 56 kg, then find the weight of the remaining one student.
a) 61 kg
b) 57 kg
c) 64 kg
d) 59 kg
e) 60 kg
Sol:
Sum of weights of 13 students = 13 * 55 = 715 kg
Sum of weights of first 6 students = 6 * 53 = 318 kg
Sum of weights of last 6 students = 6 * 56 = 336 kg
Wight of remaining one student = 715 – 318 –336 = 61 kg
