<human>:  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?
<bot>: How many sweet potatoes did Mrs. Lacson sell? ** Mrs. Lacson sold a total of 20 + 15 = <<20+15=35>>35 sweet potatoes.
How many sweet potatoes are not yet sold? ** Hence, there are still 80 - 35 = <<80-35=45>>45 sweet potatoes left unsold.
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