# Ex 6.1, 22 - Chapter 6 Class 11 Linear Inequalities

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Ex 6.1, 22 To receive Grade A in a course, one must obtain an average of 90 marks or more in five examinations (each of 100 marks). If Sunita s marks in first four examinations are 87, 92, 94 and 95, find minimum marks that Sunita must obtain in fifth examination to get grade A in the course. Marks in 1st examination = 87 Marks in 2nd examination = 92 Marks in 3rd examination = 94 Marks in 4th examination = 95 Let x be the marks obtained by Sunita in the 5th examination Average marks = 87 + 92 + 94 + 95 + 3 It is given that In order to receive grade A in the course, she must obtain an average of 90 marks or more in five examinations. i.e. Average marks 90 87 + 92 + 94 + 95 + 5 90 87 + 92 + 94 + 95 + x 90 5 368 + x 450 x 450 368 x 82 Thus, Sunita must obtain greater than or equal to 82 marks in the fifth examination.

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Chapter 6 Class 11 Linear Inequalities

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.