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  • 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 at least 60 marks.

Q21.    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 at least 60 marks.

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Let x be marks obtained by Ravi in the third test.

The student should have an average of at least 60 marks.

\therefore \, \, \, \frac{70+75+x}{3}\geq 60

              \, \, \, 145+x\geq 180

              x\geq 180-145

              x\geq 35

the student should have minimum marks of 35 to have an average of 60

Posted by

seema garhwal

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