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Find the minimun marks he sholud get in ...

Find the minimun marks he sholud get in the third test to have an average of at least 60 marks .

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Let he needs minimum x marks x marks to get the required average. Than average o f marks =`(70 + 75 + x )/(3) ge 60`
`rArr 145+ x ge 180`
` rArr x ge 35`
Therefore , Ravi needs to score at least 35 marks to get minimum average of 60 marks.
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