Question

Intr-o clasa sunt 27 de elevi din care 80% fete.Cati baieti sunt in clasa???

Answer 1

$Eu~notez~cu~B~baietii~si~cu~F~fetele$[tex]B+F=27\\\ \frac{80}{100} *27=F\\ =\ \textgreater \ F=21\\ B=27-21\\ B=6\\\\ Proba:21F+6B=27elevi [/tex]