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? Select the correct option:
A) 55  B) 65  C) 75  D) 85  E) 90
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= 
<gadget id="calculator">180/2</gadget>
<output>90</output>
90.   ANSW90R:90
<result>E</result>
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?