w-pewnej-klasie-stosunek-liczby-dziewczat-do-liczby-chlopcow-jest

$\displaystyle \frac{4}{5}$\displaystyle \frac{4}{5}

$\displaystyle \frac{4}{9}$\displaystyle \frac{4}{9}

$\displaystyle \frac{1}{4}$\displaystyle \frac{1}{4}

$\displaystyle \frac{1}{9}$\displaystyle \frac{1}{9}