Question

REPEDEEEEEE!!!!!!!!!VA ROOOOOOGGGGGGGG!!!!!!!!​

Answer 1

140 de carti vandute

$x = nr. \: total \: de \: carti\\ x - \frac{3}{7} \times x - \frac{2}{5} \times x = 24 \\ aducem \: la \: acelasi \: numitor \:comun \: 35 \\ 35 \times x - 15 \times x - 14 \times x = 840 \\ 6 \times x = 840 \\ x = 840 \div 6 \\ x = 140$