In a class of 210 students, 70 did not opt for math. 55 did not opt for science and 42 did not opt for either. How many students of the class opted for both math and science? Choose the correct choice from the following:
A) 123  B) 125  C) 127  D) 137  E) 148
210 students total   70 did not opt for math   55 did not opt for science   42 did not opt for either   Total of 140 students in math and 13 did not opt for sci but did for math    140-13= 
<gadget id="calculator"> 140-13</gadget>
<output>127</output>
127   127 students of the class opted for both math and science   Answer:127
<result>C</result>
In a class of 210 students, 70 did not opt for math. 55 did not opt for science and 42 did not opt for either. How many students of the class opted for both math and science?