The average weight of some students in a class was 58 4 kg When 5 students having the average weight...........

Quantitative Aptitude (CGL) Average

The average weight of some students in a class was 58.4 kg. When 5 students having the average weight 62.8 kg joined the

class, the average weight of all students in the class increased by 0.55 kg. The number of students initially in the class, were:

This questions was previously asked in

SSC CGL 4th March 2020 Shift-2

View All ssc Previous Year Papers

छोटे Courses बड़े Results

Master Average

Prepare through Micro-courses

Try Now

Explanation:

The average weight of some students in a class = 58.4 kg
Let the total number of students be n.
Total weight of n students = 58.4n kg
The average weight of 5 students = 62.8 kg
Total weight of 5 students = 62.8 $$\times 5$$ = 314 kg
The average weight of (n + 5) students = 58.4 + 0.55 = 58.95 kg
Total weight of (n + 5) students = 58.95(n + 5) kg
Total weight of n students + Total weight of 5 students = 58.95(n + 5)
58.4n + 314 = 58.95(n + 5)
58.4n + 314 = 58.95n + 294.75
0.55n = 19.25
n = 1925/55 = 35
$$\therefore$$ 35 students were initially in the class.

Report error

Submit Error