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The gift shop placed an order for 42 t-shirts. They ordered 3 times as many large t-shirts as small t-shirts and twice as many medium t-shirts as small t-shirts. How many of each size did they order?

Different interest rates. Mrs. Brighton invested $30,000 and received a total of #2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate?

A house has two rooms of equal area. One room is square and the other room is a rectangle 4 feet narrower and 5 feet longer than the square one. Find the area of each room.