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Question
One day at a school, one -twelfth of the students were absent and 20% of those present went on a field trip. If the number of students staying back in the school that day was 660, how many students are enrolled at that school ?
900
960
1000
1220
None of these
ANSWER : 1
Descrption
<p>Student staying at the school is (100 - 20 = 80%) of the present students.</p> <p>80% of the present students = 660</p> <p>So, 100% or total present students = 660 x 100 / 80 = 825</p> <p>But, present students = (1 - 1/12 = 11/12) of all enrolled students</p> <p>Now, 11/12 of enrolled students = 825</p> <p>So, all enrolled students = 825 x 12 / 11 = <strong>900</strong> </p>
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