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प्रश्न
The marks obtained by a student in two tests were 70 and 75. Find the minimum marks he should get in the third test to have an average of at least 60 marks.
बेरीज
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उत्तर
Let the third test mark be x.
`(70 + 75 + x) / 3 ≥ 60`
145 + x ≥ 180
x ≥ 35
So the student must score at least 35 marks on the third test.
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