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Knowledge, ability and training of Mathematics (Grade 6) 1. Xiaogang rode a bicycle. It took 0.6 hours to travel 12 kilometers. The ratio of distance to time is () 2. The circumference of a rectangle is 50 meters, and the ratio of length to width is 3:2. The length of the rectangle is () meters 3. The ratio of Mingming and Liangliang stamps is 2:5. Liangliang has 105 stamps and Mingming has () stamps 4. The ratio of number a to number B is 4:5. Number a is a fraction of number B, and number B is a fraction of the sum of number a and number B 5. 20% off a book is 16 yuan. The original price of this book is () yuan
1.1：3
5 × 3 = 15 A: the length is 15 meters
3.105 △ 5 = 21 2 × 21 = 42 answer: there are 42
4.4 △ 5 = 80% 4 + 5 = 9 4 △ 9 = 4 / 9
16 △ 80% = 20 yuan
Note: 20% off is 80%
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