Question Number 20364 by mondodotto@gmail.com last updated on 26/Aug/17
Answered by Tinkutara last updated on 26/Aug/17
$$\mathrm{59}\:=\:\mathrm{77}\:−\:\left(\mathrm{6}\:+\:\mathrm{3}{x}\right)\:+\:{x} \\ $$$$\mathrm{2}{x}\:=\:\mathrm{12} \\ $$$${x}\:=\:\mathrm{6} \\ $$
Commented by $@ty@m last updated on 26/Aug/17
$${Can}\:{you}\:{pl}.\:{explain}\:\mathrm{3}{x}\:{and}\:{x}. \\ $$
Commented by Tinkutara last updated on 26/Aug/17
Commented by Tinkutara last updated on 26/Aug/17
$${n}\left(\mathrm{P}\cup\mathrm{H}\cup\mathrm{W}\right)\:=\:{n}\left(\mathrm{P}\right)\:+\:{n}\left(\mathrm{H}\right)\:+\:{n}\left(\mathrm{W}\right) \\ $$$$−\:{n}\left(\mathrm{P}\cap\mathrm{H}\right)\:−\:{n}\left(\mathrm{H}\cap\mathrm{W}\right)\:−\:{n}\left(\mathrm{P}\cap\mathrm{W}\right)\:+ \\ $$$${n}\left(\mathrm{P}\cap\mathrm{H}\cap\mathrm{W}\right) \\ $$$$\mathrm{Given}\:\mathrm{that}\:{n}\left(\mathrm{P}\cup\mathrm{H}\cup\mathrm{W}\right)\:=\:\mathrm{59}\:\mathrm{and} \\ $$$${a}\:+\:{b}\:+\:{c}\:=\:\mathrm{6}\:\mathrm{so}\:\mathrm{that} \\ $$$${n}\left(\mathrm{P}\cap\mathrm{H}\right)\:+\:{n}\left(\mathrm{H}\cap\mathrm{W}\right)\:+\:{n}\left(\mathrm{P}\cap\mathrm{W}\right)\:= \\ $$$$\left({a}\:+\:{x}\right)\:+\:\left({c}\:+\:{x}\right)\:+\:\left({b}\:+\:{x}\right)\:=\:{a}+{b}+{c}+\mathrm{3}{x} \\ $$$$=\:\mathrm{3}{x}\:+\:\mathrm{6} \\ $$$$\mathrm{and}\:{n}\left(\mathrm{P}\cap\mathrm{H}\cap\mathrm{W}\right)\:=\:{x}. \\ $$
Commented by $@ty@m last updated on 26/Aug/17
$${Thank}\:{you}. \\ $$