Answer: 7 batches
Explanation:
If Eduardo makes 4 batches, he will need 2/3 x 4 = 8/3 cups of flour.
To add 3 more batches, he will need 3 x 8/3 = 8 cups of flour.
In total, Eduardo will need 8/3 + 8 = 32/3 + 8 = 32/3 + 24/3 = 56/3 cups of flour for 7 batches. Therefore, Eduardo will need 8 cups of flour if he makes 3 more batches, and he will need 56/3 cups of flour in total if he makes 7 batches.