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.
Given,
Marks obtained in English = 36
Marks obtained in Hindi = 44
Marks obtained in Maths = 75
Marks obtained in Science = x
Average marks of all subjects = 50
We know that,
Average marks = 
= 50 = 
= 50 × 4 = 155 + x
= x = 200 – 155 = 45.
Hence, Marks in science = 45.
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