Rahul obtained 20 and 25 marks in first two tests.Find the minimu… - Vidyadip

MCQ

Rahul obtained 20 and 25 marks in first two tests.Find the minimum marks he should get in the third test to have an average of at least 30 marks.

A
60
B
35
C
180
✓
45

✓

Answer

Correct option: D.

45

Average is at least 30 marks.
Let x be the marks in $3^\text{rd}$ test.
Average $=\frac{(20+25+\text{x})}{3}\geq30$
$\Rightarrow45+\text{x}\geq90\Rightarrow\text{x}\geq90-45\Rightarrow\text{x}\geq45.$
Minimum marks in $3^\text{rd}$ test should be 45.

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