Final answer:
To make the calculation, we need to find how many cups of flour are in a 10 lb-bag, then use the information given to determine how many loaves of bread can be made. The baker can make 20 loaves of bread with a 10 lb-bag of flour.
Step-by-step explanation:
To solve this problem, we first need to find how many cups of flour are in a 10 lb-bag. Since 1 pound of flour is equivalent to 3 cups, 10 pounds of flour would be 10 x 3 = 30 cups of flour. Next, we can use the information given in the problem to find how many loaves of bread can be made with 30 cups of flour. For every 3 cups of flour, the baker can make 2 loaves of bread. So, for 30 cups of flour, the baker can make 30/3 = 10 batches of bread.