Question

Joao gastou 40% de 3/5 de seu salario e ainda lhe restou 570.00
O salario de João é?

Answer 1

Resposta:

$x - \frac{40}{100} . \frac{3}{5} . x = 570\\\\x - \frac{4}{10} . \frac{3}{5} . x = 570\\\\x - \frac{12}{50} . x = 570\\\\x - \frac{6x}{25} = 570\\\\\frac{25x}{25} - \frac{6x}{25} = 570\\\\\frac{25x - 6x}{25} = 570\\\\\frac{19x}{25} = 570\\\\19x = 25.570\\\\19x = 14250\\\\x = \frac{14250}{19}\\\\x = 750$