A student scored 62 and 48 in two terminal exams. What is the **minimum** mark she must obtain in the annual exam to have an average of at least 60 across the three exams?
A$65$
B$80$
C$75$
D$70$
Answer & Solution
Correct answer: D. $70$
Let $x$ be the annual exam mark. Average condition:
$\dfrac{62 + 48 + x}{3} \geq 60$
$110 + x \geq 180$
$x \geq 70$.
The minimum is **70**.
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