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26 Aug 2025, 22:00
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79% (01:30) correct
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In a certain school the student body has one-fifth seniors. If all the students were at a pep rally and forty percent of the seniors left the pep rally early, what was the percent change in the number of students at the rally?
A. 8%
B. 12%
C. 20%
D. 40%
E. 60%
A. 8%
B. 12%
C. 20%
D. 40%
E. 60%
Praveena_10
26 Aug 2025, 23:49
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Let the total number of students be x
number of seniors=x/5
40% of seniors left i.e, 40/100*x/5=2x/25
% change = 2x/25x*100= 8%
number of seniors=x/5
40% of seniors left i.e, 40/100*x/5=2x/25
% change = 2x/25x*100= 8%
27 Aug 2025, 00:29
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The easiest way I find to solve such question under 30-45 seconds is below:
Assume: Number of Students 100
Number of seniors: 20 (Given 1/5th of total)
Now, 40% of seniors are leaving:Seniors left: 40%*20=8
Number of seniors remaining will be 100-seniors left which will be 92
% Change=(100-92)/100=8%
Assume: Number of Students 100
Number of seniors: 20 (Given 1/5th of total)
Now, 40% of seniors are leaving:Seniors left: 40%*20=8
Number of seniors remaining will be 100-seniors left which will be 92
% Change=(100-92)/100=8%
