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17 September, 10:17

At Billy's preschool, they have a total of 25 bicycles and tricycles. Among them all, there are 57 wheels. How many of each are there?

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  1. 17 September, 10:25
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    Let x be the number of bicycles and y the number of tricycles. x+y=25 (1) and 2x+3y=57 (2). Multiplying (1) by 2, you have 2x+2y=50. Doing (2) - (1) gives y=7. Therefore, x=25-7=18. There are 18 bicycles and 7 tricycles.
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