On the division of a mathematical problem! Xiaoxiao said, "I spent three days reading a quarter of this book." mischievous said, "I spent four days reading a third of this book." Q: who can read faster, Xiaoxiao or mischievous? Find the formula, not the equation

Same speed (1 / 4) / 3 = (1 / 3) / 4 = 1 / 12

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1. Divide 80 Xiaofeng Xiaoyu Xiaoming is the best friend in the kindergarten. Xiaofeng weighs 14kg, which is 7 / 8 of Xiaoming's weight. Xiaoming weighs 1 / 15 of Xiaoyu's weight. How many kg should Xiaoyu weigh For a road, 3 / 8 of it was built on the first day, 6 / 7 of it was built on the second day, and 221m was left. How long is the road? These are two questions~
2. Calculate by Division There are 118 students in Grade 6. One fifth of the boys and 10 girls go to the nursing home to take part in voluntary labor. The remaining boys and girls are equal in number. How many boys are there?
3. On calculation and fractional division A 10 meter long rope, the first use of 1 / 5, the second use of 1 / 5 meters, there are () meters left Two thirds of an hour and one third of two hours are () minutes The 1 / 9 of 7 meters is as long as the 7 / 9 of () meters 5 / 7 of () tons is 10.5 tons A car can travel 30 kilometers in 2 / 5 hours, and it can travel () kilometers in 20 minutes A car runs 30 kilometers in 2 / 5 hours. According to this calculation, it takes () hours to travel 25 kilometers 0.375÷1/8×25/24 2.6÷5/3 1/5÷（2/3+1/5）×15 3/8×8÷3/8×8 6.8×8/25+0.32×3.2 （7/12+11/18）÷5/36 0.375÷1/8×25/24 2.6÷5/3 1/5÷（2/3+1/5）×15 3/8×8÷3/8×8 6.8×8/25+0.32×3.2 （7/12+11/18）÷5/36 To prove an equation What can be simple should be simple
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6. Can you compare the size of - 120 / 119 and - 121 / 120 by rational division?
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11. On the mathematical problems of fractional division! 1: What is two fifths divided by two? 2: What is five out of seven divided by five? 3: What is two fifths divided by three? 4: What is two thirds divided by eight? 5: What is six out of thirteen divided by nine? 6: What is seven out of twelve divided by twelve? 7: What is three fourths divided by three? 8: What is five eighths divided by five?
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