Ravi scored 70 and 75 marks in the first two-unit test. Calculate the minimum marks he should get in the third test to have an average of at least 60 marks.

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Assume that x be the marks obtained by Ravi in the third unit test.

It is given that the student should have an average of at least 60 marks.

From the given information, we can write the linear inequality as:

(70+75+x)/3 ≥ 60

Now, simplify the expression:

⇒ (145 +x) ≥ 180

⇒ x ≥ 180 -145

⇒ x ≥ 35

Hence, the student should obtain a minimum of 35 marks to have an average of at least 60 marks.

Thanks