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Randy has a lot of homework tonight. He needs to work for 45 minutes on social studies, 40 minutes on science, and 1 hour and 15 minutes on math. It will also take him 10 minutes to get ready for bed. If he wants to be in bed at 10:00, what time does he need to start...

Andre and Sally are playing a number game. Andre tells Sally, "I'm thinking of a number between 1 and 20. If I take the number and add 5, and then subtract 3, I get 19." What number is Andre thinking of?

Mark is a carpenter. He is trying to decide how much money to charge for his next job. To do the job, he will need to buy supplies that will cost $275. He will also need to rent a machine that will cost $125. He wants to charge enough to have $150 profit (money left...