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The average marks of the students in four sections P, Q ,R and S together is 60% . The average marks of the students of P, Q, R and S separartely are 45% , 50%, 72% and 80% respectively. If the average marks of the students of P and Q together is 48% and that of the students of Q and R is 60%. What is the ratio of number of students in sections P and S ?
7 : 5
4 : 3
2 : 1
3 : 2
Since , the average marks of sections Q and R together are equal the average marks of all four sections. So, the average marks of the remaining two sections P and S together will also equal to 60%.
P —————- S 45—————80 ——–60 20———–15 4 : 3 Hence , the required ratio = 4 : 3
Hence, opton 2 is the correct answer.
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