Question

$\frac{4}{9}$ : $\frac{5}{7}$ - $\frac{1}{15}$ : 3 =

Answer 1

4 supra 9 x 7 supra 5 - 1 supra 15 x 1 supra 3. =
28 supra 45 -  1 supra 45 =
27 supra 45