Mathematics · Data Interpretation
A survey conducted among 480 students of two colleges C1 and C2 regarding the type of computers they use resulted in partial data. The ratio of the number of students in C1 and C2 is 9 : 7. In C1, 15 students use no system. In C2, 120 use only Desktop and 30 use Both. Total students using only Laptop is 195, Both is 70, and None is 40. How many students of college C1 have at least one system?
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