At the river, 25 out of 55 salmon families went to warmer waters to avoid being frozen. They had to swim 125 miles to get there! How many salmon families were left in the river?

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Dave is working to improve the yard at his house. There are two kinds of soil to choose from. If brand A is $50 for 5 kg and brand B is $48 per 4 kg, which brand is cheaper?

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The manager ordered 15 boxes of napkins, 3 boxes of paper cups, and 5 boxes each of plastic forks, knives, and spoons. How many boxes did he order in total?