A student scored an average of 60 marks in 3 subjects: Physics, Chemistry and Mathematics. If the average marks in Physics and Mathematics is 90 and that in Physics and Chemistry is 70, what are the marks in Physics?	Pick.
A) 86
B) 160
C) 76
D) 140
E) 26
Given M + P + C = 60 * 3= 
<gadget id="calculator">60 * 3</gadget>
<output>180</output>
180 --- (1)   M + P= 90 * 2= 
<gadget id="calculator">90 * 2</gadget>
<output>180</output>
180 --- (2)   P + C= 70 * 2= 
<gadget id="calculator">70 * 2</gadget>
<output>140</output>
140 --- (3)   Where M, P and C are marks obtained by the student in Mathematics, Physics and Chemistry.   P= (2) + (3) - (1) = 180 + 140 - 180= 
<gadget id="calculator">180 + 140 - 180</gadget>
<output>140</output>
140   Answer:140
<result>D</result>
A student scored an average of 60 marks in 3 subjects: Physics, Chemistry and Mathematics. If the average marks in Physics and Mathematics is 90 and that in Physics and Chemistry is 70, what are the marks in Physics?