With number 1? that would be great

Ratio - 16:10
The answers would be
1) 16:10 = 2: x => 16x=20=> x= 20/16= 1.25
2) 16:10 = x:36 => 16*36=10x=>x=57.6
3) 16:10=x:9 => 16*9=10x => x= 14.4 br /> 4) 16:10= 8:x => 16x=80 => x= 5
5) 16:10 = x:72 => 16*72=10x => x=115.2

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post