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percentages for 4 subjects in exams

Source: Spanish Mathematical Olympiad 1970 P5

December 4, 2022
Percentagealgebracombinatorics

Problem Statement

In the sixth-year exams of a Center, they pass Physics at least70%70\% of the students, Mathematics at least 75%75\%; Philosophy at least, the 90%90\% and the Language at least, 85%85\%. How many students, at least, pass these four subjects?
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