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The problem states that Karl bought some beef and pork at a butcher shop. He bought **4 21/25 pounds of beef** and left with **17/20 pounds of meat**. We are asked to find out how much pork Karl bought, expressed in decimal form.

### Let's break it down:
1. **Total weight of meat Karl bought** = Weight of beef + Weight of pork.
2. After leaving with **17/20 lb** of meat, the remaining weight will be the pork.
   
### Step-by-step solution:
- The total weight of beef Karl bought is a mixed number: **4 21/25**. To work with it, let's first convert it to an improper fraction:
  \[
  4 \frac{21}{25} = \frac{4 \times 25 + 21}{25} = \frac{100 + 21}{25} = \frac{121}{25}.
  \]

- Karl left with **17/20 lb** of meat, which means the pork equals the total weight of meat minus the beef. We need to subtract:
  \[
  \text{Pork weight} = \frac{121}{25} - \frac{17}{20}.
  \]
  
### Finding a common denominator:
The least common denominator (LCD) between 25 and 20 is 100. We rewrite both fractions:
\[
\frac{121}{25} = \frac{484}{100}, \quad \frac{17}{20} = \frac{85}{100}.
\]

Now subtract the two fractions:
\[
\frac{484}{100} - \frac{85}{100} = \frac{484 - 85}{100} = \frac{399}{100}.
\]

### Convert to decimal:
\[
\frac{399}{100} = 3.99.
\]

Thus, Karl bought **3.99 pounds of pork**.

Would you like any further explanation or details? Here are some related questions to expand your understanding:

1. How do you convert a mixed number to an improper fraction?
2. Why do we need to find a common denominator before subtracting fractions?
3. How do you simplify the subtraction of fractions?
4. What are other methods to express the result of 3.99 pounds?
5. How can you check the accuracy of the result using estimation?

**Tip**: Always ensure that units are consistent when solving problems that involve quantities like weight or volume.

At a butcher shop, Karl bought 4 21/25 lb of beef and some pork. He left with 17/20 lb of meat. Express the number of pounds of pork he bought using a decimal.

Learn how to calculate the weight of pork Karl bought by subtracting mixed fractions and converting the result to decimals. This math problem involves working with mixed numbers and fractions, perfect for students in Grade 7.

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