161852

The first lemonade is stronger tasting. I worked this out by writing each mixture's quantity of lemon and water in fraction from. After writing them, I wrote the simplified the fraction by simply crossing out it's zeros:
200/300 = 2/3
100/200 = 1/2
I did this because, I needed to figure out which mixture had the most lemon. So by performing this method I figure out that the first mixture is the most strongest tasting mixture because 2/3 is larger then 1/2. To double check I divided 2 by 3 to convert 2/3 to it's decimal form which, when rounded is 0.67. I did the same for 1/2 and got 0.5. ).67 is greater than 0.5 so now after double checking as well I know the answer is the first mixture.