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UP बोर्ड 2020 | कक्षा 12th गणित के लिए महत्वपूर्ण प्रश्न | Most Important Questions | Class 12

In a class room the ratio of number of girls to that of boys is 3:4 . The average height of students in the class is 4.6feet. If the average height of the boys in the class is 4.8 feet, then what is the average height of the girls in the class?

Let l = {0,pm1,pm2,pm3,pm4,...} and R={(a,b):(a-b)//4=k,kinl} is an equivalence relation, find equivalence class[0].