Final answer:
To find the number of scoops of flour Harper used, set up a proportion and solve for x.
Step-by-step explanation:
To find the number of scoops of flour Harper used, we can set up a proportion using the given information. Since one batch requires 2 eggs and 3 scoops of flour, the proportion can be set up as follows: 2 eggs / 3 scoops of flour = 18 eggs / x scoops of flour. Cross-multiplying, we get 2x = 54. Dividing both sides by 2, we find that Harper used 27 scoops of flour.
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