Question

alguem me ajuda ?
(2 quintos + 1 quinto) : (1 quarto +2 quartos )

Answer 1

$\big(\frac{2}{5} +\frac{1}{5} \big):\big(\frac{1}{4} +\frac{2}{4} \big)=\big(\frac{2+1}{5} \big):\big(\frac{1+2}{4} \big)=\frac{3}{5} :\frac{3}{4} =\frac{3}{5} \cdot\frac{4}{3} =\frac{3\cdot4}{5\cdot3} =\frac{12x^{:3} }{15_{:3} } =\frac{4}{~5}$