Q: Julia collects old watches. She owns 20 silver watches, and three times as many bronze watches. She decided to buy gold watches to add to her collection, a number that represents 10% of all the watches she owns. How many watches does Julia own after this purchase?
A: Julia owns 3 * 20 = 60 bronze watches. 60 + 20 = 80 total silver and bronze watches. 10% of all Julia's watches is 80 * 10 / 100 = 8 watches, and she decided to buy so many gold watches. So in total Julia is in possession of 20 + 60 + 8 = 88 watches. The answer is 88.

Q: Melissa is repairing her shoes. For each shoe, it takes her 5 minutes to replace the buckle and 10 minutes to even out the heel. How many minutes does Melissa spend on this project total?
A: First find the total time Melissa spends per shoe: 5 minutes + 10 minutes = 15 minutes. Then double that amount because there are 2 shoes: 15 minutes * 2 = 30 minutes. The answer is 30.

Q: Clarissa is responsible for getting 10 copies of a manuscript printed and having each copy bound. The printers charge $0.05 per page to copy it and $5.00 per manuscript to have it bound. If the manuscript is 400 pages, how much will it cost to have it copied and bound 10 times?
A:
The manuscript is 400 pages and the printers charge $0.05 per page for a total of 400 * .05 = $20.00 per manuscript. She needs 10 copies made and it costs $20.00 per manuscript so that's 10 * 20 = $200.00. She also needs each of the 10 copies to be bound, which is $5.00 per manuscript so that's 5 * 10 = $50.00. It will cost $200.00 to have them printed and $50.00 to have them bound for a total of 200 + 50 = $250.00. The answer is 250.