Average weight of some students is 55kg.Among them 20 student's weight is 60kg and the weight of the rest students is 51 kg.What is the total no. Of students?
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Answer:
45
Step-by-step explanation:
Average weight of some students is 55kg
Let say number of students = x
Weight of x students = 55x kg
Av weight of 20 students = 60 kg
weight of 20 students = 20 * 60 = 1200 kg
remaining students = x - 20
weight of rest students = (x-20) * 51 kg
(x-20) * 51 + 1200 = 55x
=> 51x - 1020 + 1200 = 55x
=> 180 = 4x
=> x = 45
Total students = 45
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