The total number obtained by a student in Physics, Chemistry and Mathematics together is 120 more than the marks obtained by him in Chemistry. What is the average mark obtained by him in Physics and Mathematics together?

A 40

B 60

C 120

D Cannot be determined

Solution

Correct Answer: Option B

মনে করি,
পদার্থ বিজ্ঞানে প্রাপ্ত নম্বর=x
রসায়ন বিজ্ঞানে প্রাপ্ত নম্বর=y
গণিতে  প্রাপ্ত নম্বর=z
x+y+z  = y+120
⇒ x+z = 120
⇒ x+z/2 = 120/2
⇒ x+z/2 = 60

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