Question

quanto é 18% +25% - 12% =??​

Answer 1

$18\%\:+25\%\:-12\%\:\\\\18\%\:=\frac{18}{100}\\\\=\frac{9}{50}\\\\25\%\:=\frac{25}{100}\\\\=\frac{1}{4}\\\\12\%\:=\frac{12}{100}\\\\=\frac{3}{25}\\\\=\frac{9}{50}+\frac{1}{4}-\frac{3}{25}\\\\MMC\\ >>\\=\frac{18}{100}+\frac{25}{100}-\frac{12}{100}\\\\\frac{18}{100}+\frac{25}{100}-\frac{12}{100}=\frac{18+25-12}{100}\\\\18+25-12=31\\\\=\frac{31}{100} // = ( decimal> 0,31 )$