Question

4/5*c-7/15*c+1/3*c=3/5

Answer 1

$\frac{4}{5} c - \frac{7}{15} c = \frac{12}{15} c - \frac{7}{15} c = \frac{5}{15} c = \frac{1}{3} c$
$\frac{1}{3} c + \frac{1}{3} c = \frac{2}{3} c$
$\frac{2}{3} c = \frac{3}{5} \\ c = \frac{3}{5} \div \frac{2}{3} = \frac{3}{5 } \times \frac{3}{2}$
$c = \frac{9}{10} = 0.9$