3 * 0.7 + 0.4/0.5 *0.2

3* 1/7 + 1/4 : 1/5 * 1/2 = 3/7 + 5/4 * 1/2= 3/7 + 5/8 = (8*3)/56 + (5*7)/56 = (24+35)/56=59/56=1.3/56