Rates are the percentage and ratios are like this 3:1. so, in that 3:1 ratio, there is 3 to 1 cookies to cups of milk. So there is 75% cookies and 25% milk.
The ratio can consequently be expressed as fractions or as a decimal. 2:5 in decimals is 0.4. A rate is a little bit different than the ratio, it is a special ratio. It is a comparison of measurements that have different units, like cents and grams.
