To solve this problem, let's start by setting up equations based on the given information.
Let's assume that the amount of lemon syrup in both Cup A and Cup B is x mL.
According to the given ratio, the amount of water in Cup A is in the ratio 5 : 2. So, the amount of water in Cup A can be expressed as 5y mL, where y is a common factor.
Similarly, the amount of water in Cup B is in the ratio 6 : 1. So, the amount of water in Cup B can be expressed as 6y mL.
Now, we are given that Cup B contains 189 mL more water than Cup A. Using this information, we can set up the following equation:
6y - 5y = 189
Simplifying the equation gives us:
y = 189
Therefore, the value of y is 189.
Now, let's calculate the amount of lemon syrup in Cup A, which is x mL:
Since the ratio of lemon syrup to water in Cup A is 2 : 5, we can write the equation:
2x = 5y
Substituting the value of y as 189, we have:
2x = 5 * 189
Simplifying the equation gives us:
2x = 945
Dividing both sides by 2, we get:
x = 472.5
Therefore, the amount of lemon syrup in Cup A is 472.5 mL.
Please note that the final answer has been rounded to one decimal place.