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The question states that Pak Mardi initially has 50 liters of cooking oil and then adds \( 27 \frac{1}{2} \) liters to his stock. After that, he packs all the oil into containers that hold half a liter each.

To solve this:

1. Convert \( 27 \frac{1}{2} \) liters to an improper fraction or decimal. 
   \[
   27 \frac{1}{2} = 27 + \frac{1}{2} = 27.5 \text{ liters}
   \]

2. Add the initial stock of 50 liters to the new stock of 27.5 liters:
   \[
   50 + 27.5 = 77.5 \text{ liters}
   \]

3. Pak Mardi packs the oil into containers of 0.5 liters each, so the total number of containers can be calculated by dividing the total amount of oil by 0.5:
   \[
   \frac{77.5}{0.5} = 155 \text{ containers}
   \]

Thus, the total number of cooking oil containers Pak Mardi has is 155.

The correct answer is **B. 155**.

Would you like further details or have any questions?

Here are 5 related questions to explore further:
1. How would the solution change if Pak Mardi used 1-liter containers instead of 0.5-liter containers?
2. What if Pak Mardi initially had 60 liters of oil instead of 50 liters?
3. How do you convert a mixed number like \( 27 \frac{1}{2} \) into an improper fraction?
4. What would be the total number of containers if the stock increased by 10% before packaging?
5. How many containers would be needed if each container could hold 0.25 liters?

**Tip:** When dealing with fractions in word problems, it’s often helpful to convert mixed numbers into improper fractions or decimals for easier calculations.

Pak Mardi adalah pemilik toko sembako. Awalnya ia memiliki 50 liter minyak goreng, lalu menambah stok 27 1/2 liter. Pak Mardi mengemas seluruh stok minyak gorengnya dalam kemasan setengah liter. Berapa banyak minyak goreng kemasan yang dimiliki oleh Pak Mardi?

Learn how to solve a word problem involving the addition of mixed fractions and the division of total liters into containers. This problem is perfect for students in Grades 6-8 and includes step-by-step explanations.

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