Let's solve the problem shown in the image step by step.

Part (a) How much paint did they have in all?

The fourth graders started with $\frac{3}{4}$ gallons of paint, and one of the parents brought another $\frac{2}{4}$ gallons of paint.

To find how much paint they had in total, we need to add these two fractions: $\frac{3}{4} + \frac{2}{4} = \frac{3 + 2}{4} = \frac{5}{4}$

So, the total amount of paint they had is $\frac{5}{4}$ gallons, which can also be written as $1 \frac{1}{4}$ gallons.

Answer for part (a): They had $1 \frac{1}{4}$ gallons of paint in all.

Part (b) Did the fourth graders have any paint left over?

We are told that it took $5 \frac{1}{4}$ gallons of paint to cover the wall. We need to compare the amount of paint they had, $1 \frac{1}{4}$ gallons, with the amount needed to cover the wall.

Clearly, $5 \frac{1}{4}$ gallons is more than $1 \frac{1}{4}$ gallons, so the fourth graders did not have enough paint to cover the wall, and thus had no paint left over.

Would you like more details on any part of this? Let me know!

Here are some related questions to deepen your understanding:

1. How do you convert improper fractions into mixed numbers?
2. How can you find the least common denominator when adding fractions with different denominators?
3. How can you estimate whether you will have enough of a resource by comparing mixed numbers?
4. What is the difference between a proper fraction and an improper fraction?
5. How do you subtract fractions or mixed numbers?

Tip: When adding or subtracting fractions, always make sure the denominators are the same before performing the operation.