Let us assume, x be the marks obtained by Ravi in his third unit test
According to question, the entire students should have an average of at least 60 marks
= \( \dfrac{(70 + 75 + x)}{3}≥ 60\)
= 145 + x ≥ 180
= x ≥ 180 – 145
= x ≥ 35
Hence, all the students must obtain 35 marks in order to have an average of at least 60 marks
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