Rohit scored 65 and 70 marks in two test. Find the minimum marks he should score in the third test to have an average of at least 65 marks.

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Solution

The correct option is D 60
Let the marks needed by Rohit in the third test be x
Therefore average of the three tests=
$a v e r a g e = \frac{65 + 70 + x}{3} \geq 65$
$x + 70 \geq 3 (65) - 65$
$x \geq 130 - 70$
$x \geq 60$
Hence he needs $60$ marks or more in his test
Answer is $A$

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Rohit scored 65 and 70 marks in two test. Find the minimum marks he should score in the third test to have an average of at least 65 marks.

The correct option is D 60Let the marks needed by Rohit in the third test be xTherefore average of the three tests=average=65+70+x3≥65x+70≥3(65)−65x≥130−70x≥60Hence he needs 60marks or more in his testAnswer is A

The correct option is D 60
Let the marks needed by Rohit in the third test be x
Therefore average of the three tests=
$a v e r a g e = \frac{65 + 70 + x}{3} \geq 65$
$x + 70 \geq 3 (65) - 65$
$x \geq 130 - 70$
$x \geq 60$
Hence he needs $60$ marks or more in his test
Answer is $A$