7.5:2.5=3:1; 1.4:2.1=2:3; 14:7=2:1; 3.8:1.9=2:1; 2.6:5.2=1:2; 0.6:0.2 =3:1; 2.4:4.8=1:2; 15:25 =3:5; 3.2:24=0.4:3=2:15; 2.5:5 =1:2