Ravi obtained 70 and 75 marks in his first two unit tests. What is the **minimum** he must score in the third test to have an average of at least 60?
A$35$
B$30$
C$40$
D$45$
Answer & Solution
Correct answer: A. $35$
Let $x$ be the third test mark. $\dfrac{70 + 75 + x}{3} \geq 60 \Rightarrow 145 + x \geq 180 \Rightarrow x \geq 35$.
Minimum is **35**.
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