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13. Through previous results, it is observed that70% of the students with atleast 90%attendance attain A grade and 10% of irregularstudents get A grade in their final examinationAt the end of the session, it is found that xstudents have atleast 90% attendance and ystudents are irregular. If 14 students get Agrade in their final examination for thatsession, represent it by a linear equation in xand y. Use it to find the number of irregularstudents if 16 students have atleast 90%attendance.Write the values reflected in this problem. |
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Answer» Given : 70% of the students with atleast 90% attendance attain A grade 10% of irregular students get A grade x students have atleast 90% attendance and y students are irregular 14 students get A To Find : the number of irregular students if 16 students have atleast 90% attendance Solution: 70% of the students with atleast 90% attendance attain A grade 10% of irregular students get A grade x students have atleast 90% attendance => (70/100)x = 0.7 x will attain A grade y students are irregular. => (10/100)y = 0.1y will attain A grade attain A grade = 0.7x + 0.1y 14 students get A grade in their FINAL examination => 0.7x + 0.1y = 14 => 7x + y = 140 16 students have atleast 90% attendance. => x = 16 => 7(16)+ y = 140 => y = 28 Students with REGULAR attendance get better grade, Learn More: in a furniture shop 24 were BOUGHT at the rate of rupees per table the ... represent the cost of parking for FOUR wheeler in terms of linear ... |
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