Question Number 21013 by aplus last updated on 10/Sep/17
Commented by aplus last updated on 10/Sep/17
$$\mathrm{hhelp}\:\mathrm{guyselp}\:\mathrm{guys} \\ $$
Answered by Tinkutara last updated on 10/Sep/17
$${n}\left({P}\cap{C}\right)={x},{n}\left({P}\right)=\mathrm{3}{x},{n}\left({C}\right)=\mathrm{6}{x} \\ $$$${n}\left({P}−{C}\right)=\mathrm{2}{x},{n}\left({C}−{P}\right)=\mathrm{5}{x} \\ $$$$\Rightarrow\mathrm{2}{x}+{x}+\mathrm{5}{x}=\mathrm{40}\Rightarrow{x}=\mathrm{5} \\ $$$${Only}\:{physics}=\mathrm{2}{x}=\mathrm{10} \\ $$