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Enrollment in math courses at Kennedy High School in Bloomington, Minnesota is shown in the circle graph at right. (If you are unfamiliar with circle graphs, refer to the Math Notes box in Lesson 10.1.1 for assistance.) If there are students enrolled in math courses, approximately how many students are enrolled in Algebra? In Geometry? In Calculus?  

A circle with 5 sections, labeled as follows: Math Analysis & Algebra 2, together are one fourth of the circle, Geometry, one fourth of the circle, Algebra and Calculus together, half of the circle, with Calculus about one twentieth of the circle.

What approximate percentage of the circle graph is taken up by Algebra, Geometry, and Calculus?