there are n students in a school if our percent among the students are 12 years or younger who is of the following expressions represents the number of students who are older than 12?
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The number of student who are 12 years or younger = n*r% =nr/100
The number of student who are older than 12 = n - nr/100 = n(100-r)/100
Ans: D (n(100-r)/100)
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