Q21 of 51 Page 6

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 atleast 60 marks.


Let he should get x marks in the third test such that

⇒ ⇒ 145 + x ≥ 180

⇒ x ≥ 180 – 145 ⇒ x ≥ 35

Hence, he should get 35 or more marks in the third test.

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