40:72 = 5:9
It simplifies as a ratio of 1:4
5:11
18 to 25
5 to 10 = 1 to 2
If you mean as a ratio then it is 1/2
3.6 = 36/10. You can simplify that ratio if you like.
The ratio is simply 4:40. You could, if you so wished, simplify it to 1:10.
12/25this is because you shouldn't have decimals on the numerator
12 : 20 = 6 : 10 = 3 : 5
simplify the ratio 18b^2 to 45b
5.6/10 = 14/25