Ratio
Percentage
adverb, noun
Divide then join something back together. When you join it back together, it won't be whole again, but you can see the two parts you divided apart. You can also compare them and see which is bigger and by how much. You can easily find the ratio this way, too.
わりあい
This word uses the kun'yomi readings for both kanji. You've learned them both already, so you should be able to read this already!
日本では、蕎麦粉の割合が100%の蕎麦を十割り蕎麦と呼びます。
In Japan, noodles that contain one hundred percent buckwheat flour are called Juwari-soba.