he total marks obtained by a student in Physics, Chemistry and Mathematics is 180 more than the marks obtained by him in Physics. What is the average mark obtained by him in Chemistry and Mathematics?
Pick:	A) 55	B) 65	C) 75	D) 85	E) 90

Rationale: let the marks obtained by the student in physics , chemistry and mathematics be p , c and m respectively . p + c + m = 180 + p c + m = 180 average mark obtained by the student in chemistry and mathematics = ( c + m ) / 2 = 180 / 2 = 90 . answer : e
Answer: E