Question

la un spectacol merg 350 de elevi,Stiind ca nr fetelor este 3/4din nr baietilor sa se afle cati baieti si cate fete merg la spectacol

Answer 1

$f+b=350 \\\\ f=\frac{3}{4}*b \\\\ \frac{3b}{4}+b^{(4}=350^{(4} \\\\ 3b+4b=350*4 \\\\ 7b=350*4 \ \ \ |:7 \\\\ b=50*4 \\\\ \boxed{b=200} \\\\ f=\frac{3}{\not4}*\not200 \\\\ f=3*50 \\\\ \boxed{f=150}$