25% students of a class failed in Chemistry and 40% failed in Physics where 10% did not pass in any of the two subjects. If 30 students passed in only Physics, how many of them passed in both the subjects.  Options:
A) 60
B) 70
C) 80
D) 90
E) 100
n(C)=75% , n(P)=60% , n(PUC)= 90% =&gt; n(PnC)= 75% + 60% - 90% = 45%. given n(P) - n(PnC)75  + 60  - 90= 
<gadget id="calculator">75  + 60  - 90</gadget>
<output>45</output>
45%. given n(P) - n(PnC)= 30 , 60% - 45% = 30 =&gt; 15% = 30 =&gt; 1% = 2 . n(PnC) = 45% = 90   ANSWER:90
<result>D</result>
25% students of a class failed in Chemistry and 40% failed in Physics where 10% did not pass in any of the two subjects. If 30 students passed in only Physics, how many of them passed in both the subjects.