Final answer:
To ensure that 1/4 of the 16 entrees on a menu are vegetarian, the restaurant must offer 4 vegetarian entrees.
Step-by-step explanation:
The question asks how many vegetarian entrees need to be on a restaurant menu if 1/4 of them must be vegetarian, and there are 16 entrees in total. To find this, we'll calculate 1/4 of 16:
1/4 × 16 = 16 / 4 = 4
Therefore, 4 entrees on the menu must be vegetarian to meet the requirement that 1/4 of the entrees are vegetarian.