It takes 200 pieces to pave the classroom with 15 cm long square bricks. If you use 25 cm long square bricks to pave the classroom, how many bricks do you need?
Let x bricks be needed. According to the meaning of the question, 25 × 25X = 15 × 15 × 200, & nbsp; & nbsp; 625x = 45000, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 45000 △ 625, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 72; a: 72 bricks are needed
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