The chef should order 7 cases of lettuce.
Step-by-step explanation:
Lettuce is a leafy vegetable enriched with vitamin C, calcium and potassium. Hence it is commonly used in the hospital foodservice facility.
The kitchen supervisor decided to order some lettuce cases. On discussing with the chef, he came to know that half a case of lettuce is used per day. They have a stock of two-and-one-half cases of lettuces on the day of order. The lead time of the lettuce is three days. So the chef decided to order seven cases of lettuce.