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Learn the math answers in the second volume of the sixth grade
39:3,4,2, 12,8,24.

be in reverse ratio

11:12 * 200 = 2400 cm = 24 m 10*200=2000 cm =20 m 2*200=400 cm =4 m.

24*20=480 square meters

12:8 16 24 32 40

Y= 80x% is in direct proportion, because the ratio of the current price to the original price is certain.