At a certain university, the ratio of the number of teaching assistants to the number of students in any course must always be greater than 3:80. At this university, what is the minimum number of students possible in a course that has 5 teaching assistants?
A. 130
B. 131
C. 132
D. 133
E. 134
Please provide explanation and strategy!!!
Thanks.
GMAT Prep ?? (Ratio)
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3:80
You have 5 teachers so let's respect the ratio to see what is the number of students according to this ratio.
Cross multiplying:
5*80/3 = 133.3333333333................
So theorically if we want to respect the ratio of 3:80 when we have 5 professors we can have a maximum of 133 + 0.333... of a student.
Given they ask us the maximum in concrete terms, it is 133.
And not 134 because in that case we would be above the ratio of 3:80
You have 5 teachers so let's respect the ratio to see what is the number of students according to this ratio.
Cross multiplying:
5*80/3 = 133.3333333333................
So theorically if we want to respect the ratio of 3:80 when we have 5 professors we can have a maximum of 133 + 0.333... of a student.
Given they ask us the maximum in concrete terms, it is 133.
And not 134 because in that case we would be above the ratio of 3:80
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