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We have 2 lemon for every 3 water for the first glass and 1 lemon and 2 water for the other. We need to make the parts that are water to the same amount. 2 and 3 both go into 6.
First glass:
3x2=6 for the water now we need to multiply the lemon part by 2 as well and we get 4, so the ratio for the first glass is 4:6 lemon to water.
Second glass:
2x3=6 for the water and 1x3=3 for the lemon, the ratio is 3:6

The first glass has more lemon than the second
4:6 > 3:6