Final answer:
Mrs. Lee can bake 105 cookies in 42 minutes at the same rate.
Step-by-step explanation:
To find out how many cookies Mrs. Lee can bake in 42 minutes at the same rate, we can set up a proportion. Since she bakes 25 cookies in 10 minutes, the ratio of cookies to minutes is 25/10. We can use this ratio to find the number of cookies she can bake in 42 minutes:
25/10 = x/42
To solve this proportion, we can cross-multiply and then divide:
25 * 42 = 10 * x
x = (25 * 42) / 10
x = 105
Therefore, Mrs. Lee can bake 105 cookies in 42 minutes.