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Let's solve the problem step by step:

### Problem Statement
There are 40 marbles in total, 5 of which are green. The goal is to find the probability of picking a marble that is **NOT green**, and express it as both a reduced fraction and a percentage.

### Steps to Solve:
1. **Number of non-green marbles**:
   \[
   \text{Non-green marbles} = 40 - 5 = 35
   \]

2. **Probability as a fraction**:
   The probability of picking a non-green marble is the ratio of non-green marbles to the total marbles:
   \[
   \text{Probability} = \frac{\text{Non-green marbles}}{\text{Total marbles}} = \frac{35}{40}
   \]
   Simplifying the fraction:
   \[
   \frac{35}{40} = \frac{7}{8}
   \]

3. **Probability as a percentage**:
   Convert the fraction \(\frac{7}{8}\) to a percentage:
   \[
   \frac{7}{8} \times 100 = 87.5\%
   \]
   Rounding to the nearest whole percent:
   \[
   88\%
   \]

### Final Answer:
\[
\text{Probability} = \frac{7}{8} \text{ or } 88\%
\]

Would you like a detailed explanation of any of these steps, or do you have any further questions?

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Here are 5 related questions to expand your understanding:
1. What is the probability of picking a **green** marble from the bag?
2. How would the probability change if 10 more green marbles were added to the bag?
3. What is the probability of randomly selecting two non-green marbles in a row without replacement?
4. If the total number of marbles were reduced to 20 while keeping the same number of green marbles, what would the new probability of picking a non-green marble be?
5. How can we use probability theory to estimate outcomes in larger real-world scenarios like lotteries or quality control?

### Tip:
Always simplify fractions when working with probabilities, as it makes it easier to compare and interpret them in different contexts.

A bag contains 40 marbles. Five of them are green. What is the probability of randomly picking a marble that is NOT green? Show answer as reduced fraction and as percent rounded to whole %.

Learn how to calculate the probability of picking a non-green marble from a bag containing 40 marbles, 5 of which are green. The solution includes a reduced fraction and percentage calculation. This problem is suitable for students in Grades 5-7.

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