The total marks obtained by a student in Mathematics and Physics is 90 and his score in Chemistry is 30 marks more than that in Physics. Find the average marks scored in Mathamatics and Chemistry together.  Choose the correct choice from the following answers:
A) 40
B) 30
C) 25
D) Data inadequate
E) None of these.
Let the marks obtained by the student in Mathematics, Physics and Chemistry be M, P and C respectively.   Given , M + C = 90 and C - P = 30 M + C / 2 = [(M + P) + (C - P)] / 2 = (90 + 30) / 2= 
<gadget id="calculator">(90 + 30) / 2</gadget>
<output>60</output>
60.   ANSWNone of these.R:None of these.
<result>E</result>
The total marks obtained by a student in Mathematics and Physics is 90 and his score in Chemistry is 30 marks more than that in Physics. Find the average marks scored in Mathamatics and Chemistry together.