Ex 6.1, 21 Ravi obtained 70 and 75 marks in first two unit test. Find the minimum marks he should get in the third test to have an average of at least 60 marks. Marks in 1st test = 70 Marks in 2nd test = 75 Let marks in 3rd test = x Let x be the marks obtained by Ravi in the third unit test. Average marks = ﷐70 + 75 + 𝑥﷮3﷯ It is given that Average marks is at least 60 marks, i.e. Average marks ≥ 60 ﷐70 + 75 + 𝑥﷮3﷯ ≥ 60 70 + 75 + x ≥ 60 × 3 145 + x ≥ 180 x ≥ 180 – 145 x ≥ 35 Hence, Ravi should obtain atleast 35 marks in 3rd unit test

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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