in an examination, 30 % of total students failed in hindi, 35 % failed in english and 35 % in both. the percentage of these who passed in both the subjects is:	Choose the correct choice:
A) 10 %  B) 20 %  C) 30 %  D) 70 %  E) 50 %
<gadget id="calculator">30 + 35</gadget>
<output>65</output>

<gadget id="calculator">65 - 35</gadget>
<output>30</output>

<gadget id="calculator">100 - 30</gadget>
<output>70</output>

<result>D</result>
in an examination, 30 % of total students failed in hindi, 35 % failed in english and 35 % in both. the percentage of these who passed in both the subjects is:
subtract(const_100, subtract(add(30, 35), 35))
"pass percentage = 100 - ( 30 + 35 - 35 ) = 100 - 30 = 70 answer : d"