I'm pretty sure there is an error in the answer. Because in the question we do not know how much laundry Scottie has which is what the question asks. But in the answer it only talks about Scottie folding Roy's clothes not Roy folding Scottie's clothes which was the original question. Is there anyway I can send this to the people operating the contest?

Roy usually spends 5050 minutes folding all of his clothes after his weekly round of laundry. Scottie came to visit Roy to take him out for dinner while he was folding his clothes. Since Scottie was hungry and Roy still had half of his laundry to fold, he decided to jump in and help Roy finish folding his clothes.

If they were done folding Roy's clothes 1515 minutes after Scottie started helping, how much time would it have taken Roy to fold all of Scottie's clothes by himself? Give your answer in minutes rounded to the nearest whole minute.

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Working together, they folded half of the clothes in 1515 minutes, so it would have taken them 3030 minutes to fold all of the clothes together. Thus in one minute they can fold 130130 of the clothes.

Since Roy can fold all of his clothes in 5050 minutes, in one minute he can fold 150150 of his clothes. Hence, in one minute, Scottie could fold 130−150=175130−150=175 of the clothes. This means it would take Scottie 7575 minutes to fold all of Roy's clothes all by himself.