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A reduced fat cookie contains 4 g of fat per serving. In order for food to be termed 'reduced fat', it must have at least 20% less fat than the regular item. What can you conclude about how much fat is in a serving of the regular cookie?

To solve this problem, let's analyze the given information:

1. The reduced-fat cookie contains **4 grams of fat** per serving.
2. To be classified as a "reduced fat" product, the cookie must have at least **20% less fat** than the regular version.

Let \( x \) be the amount of fat in a serving of the regular cookie.

Since the reduced-fat version must have at least 20% less fat than the regular cookie, we can write:

\[
4 = x - 0.2x
\]

Simplify the equation:

\[
4 = 0.8x
\]

Solve for \( x \):

\[
x = \frac{4}{0.8} = 5
\]

Thus, the regular cookie must contain **5 grams of fat** per serving. 

### Conclusion:
A serving of the regular cookie contains **5 grams** of fat.

Would you like more details or have any questions?

### Follow-up Questions:
1. What is the formula for calculating the percentage reduction?
2. How would the calculation change if the reduced-fat cookie had 3 grams of fat?
3. What if the regular cookie contained 6 grams of fat instead?
4. How does the percentage reduction affect the nutritional labeling of products?
5. Can a food product with more than 20% reduction still not be labeled as "reduced fat"?

### Tip:
Always double-check that your percentage calculations match the requirements given, especially in nutritional contexts!

Learn how to determine the fat content of a regular cookie when given the fat content of a reduced-fat cookie and the percentage reduction required for a 'reduced fat' label. This problem involves algebraic concepts, percentage calculations, and linear equations. Suitable for students in Grades 6-8.

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