Question

calculati (3 supra 5 x 2 supra 7) x 21 supra 18=

Answer 1

($\frac{3*2}{5*7} * \frac{21}{18} = \frac{6}{35} * \frac{21}{18} = \frac{3}{5} * \frac{3}{9} = \frac{3}{5*3} = \frac{1}{5}$