Mrs. Lacson harvested 80 sweet potatoes. She sold 20 of them to Mrs. Adams and 15 of them to Mr. Lenon. How many sweet potatoes are not yet sold?
Step-by-step reasoning:
45
Mrs.

Lacson sold a total of 20 + 15 = 35 sweet potatoes.

Hence, there are still 80 - 35 = 45 sweet potatoes left unsold.

.

The answer is 45