**Question:**

Arun scored 36 marks in English, 44 marks in Hindi, 75 marks in mathematics and *x* marks in science. If he has secured an average of 50 marks, find the value of *x*.

**Solution:**

Marks scored by Arun in English = 36

Marks scored by Arun in Hindi = 44

Marks scored by Arun in mathematics = 75

Marks scored by Arun in science = *x*

Average marks = 50

Thus, we have:

Average marks $=\frac{36+44+75+x}{4}$

$\Rightarrow 50=\frac{155+x}{4}$

$\Rightarrow 155+x=200$

$\Rightarrow x=200-155=45$

$\therefore$ Marks scored by Arun in science $=45$

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