Question

7/20:2.7:1.35+(0.4:2 1/2)*(4.2-1 3/40)

Answer 1

$\frac{7}{20} * \frac{10}{27} * \frac{20}{27} +( \frac{4}{10} * \frac{2}{5} )*( \frac{42}{10} - \frac{43}{40} )= \frac{70}{729} + \frac{4}{25} * \frac{125}{40} = \frac{70}{729}+ \frac{1}{2} = \frac{869}{1458}$