To find out how many cups of milk Liam needs to make just 1 batch of muffins, you can divide the total amount of milk by the number of batches.

Liam uses 3 cups of milk to make 4 batches of muffins. So, the amount of milk needed for 1 batch is:

$\text{Milk per batch} = \frac{3 \text{ cups}}{4 \text{ batches}} = 0.75 \text{ cups}$

Thus, Liam needs 0.75 cups (or 3/4 cups) of milk to make 1 batch of muffins.

Would you like any more details or have any questions? Here are some related questions:

1. How much milk would Liam need to make 6 batches of muffins?
2. If Liam had 9 cups of milk, how many batches of muffins could he make?
3. If the recipe changed and now required 5 cups of milk for 4 batches, how much would be needed for 1 batch?
4. What is the ratio of milk to batches in this problem?
5. How could you express the milk needed per batch as a fraction?

Tip: Understanding ratios can help solve problems where quantities are scaled up or down.