Answer: 20 Days
Explanation:
Every day, Sylvia will eat 3 servings.
She needs 60 servings in total before she can meet with her doctor.
60 servings divided by 3 servings per day= 20 days
For 20 days, she must eat 3 servings of vegetables.
Considering that Sylvia will eat 3 servings before meeting her doctor on the 20th day, the least number of days she needs is 20.