Ketty bought 750.25 milliliters of dish soap and has already used 230.12 milliliters. 

The Correct Answer and Explanation is:

Correct Answer: 520.13

Explanation:

To determine how much dish soap Ketty has left, we need to perform a subtraction calculation. The problem provides two key pieces of information: the initial amount of dish soap Ketty bought and the amount she has already used.

First, let’s identify the given values from the word problem.
The initial amount of dish soap is 750.25 milliliters.
The amount of dish soap used is 230.12 milliliters.

The question asks, “How much does Ketty have left?” This phrase indicates that we must subtract the quantity used from the original total quantity. The operation is therefore subtraction. We can set up the problem as follows:

Amount Left = Initial Amount – Amount Used
Amount Left = 750.25 ml – 230.12 ml

To solve this, we will subtract the two decimal numbers. It is crucial to align the numbers vertically by their decimal points to ensure that we are subtracting the correct place values from each other.

Here is the step by step calculation:Generated code

750.25
- 230.12
---------

We begin the subtraction from the rightmost column, which is the hundredths place.

1. Hundredths place: 5 minus 2 equals 3.
2. Tenths place: 2 minus 1 equals 1.
3. Decimal point: We bring the decimal point straight down into our answer.
4. Ones place: 0 minus 0 equals 0.
5. Tens place: 5 minus 3 equals 2.
6. Hundreds place: 7 minus 2 equals 5.

Combining these results, we get the final answer.Generated code

750.25
- 230.12
---------
  520.13

Therefore, Ketty has 520.13 milliliters of dish soap left. This calculation is a practical example of how basic arithmetic is used in everyday life for managing supplies and resources. By correctly identifying the operation needed and carefully executing the subtraction of decimal numbers, we can arrive at the precise remaining amount.