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Abhinav obtained 65 and 80 marks in fir...

Abhinav obtained 65 and 80 marks in first two unit test .Find the minimum marks he should get in the third test of have an average of at least 70 marks.

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Abhinav obtained 65 and 80 marks in first two unit tests Let x be the marks obtained by Abhinav in the third unit test Since he should have an average of at least 70 marks. ,
`(65 + 80 +x)/3 ge 70 `
`rArr 145+x ge 210 `
`rArr x ge 210 - 145 `
`rArr x ge 65`
Thus , Abhinav must obtain minimum of 65 marks to have an average of at least 70 marks.
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