Solving a simple sixth grade math problem The new community has built a rectangular swimming pool at one end of an 80 meter long rectangular field. The rest of the field is just a square. How many meters is the perimeter of the swimming pool? Please write down the process! This is a very simple problem, but I just can't do it. I always feel that there are few conditions

Let the side length of the remaining square be X. then the width of the original rectangle is X. so the perimeter of the swimming pool is (80-x) * 2 + X * 2 = 160 (m). Let the side length of the remaining square be X. (80-x) * 2 + X * 2 = 160 (m)

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2. Answers to the final self-test of grade 6 mathematics volume 2 (knowledge and ability training) from page 70 to 74 of Jiangsu Education Press Thank you! 1: In 2008, the 29th Olympic Games was held in Beijing. The building area of the main venue of the Olympic Games is 2.580300 square meters. This number is written as () square meters, which is rewritten as () ten thousand square meters. 2: 80: () = four fifths = () 25 = () percent = () (fill in decimal) 3: It is known that the ratio of medicine to water is 1:200 when 0.8kg of liquid medicine is used to prepare liquid medicine, and () kg of water needs to be prepared. 4: Of the three numbers of 2.05, 25% and 3 / 4, the smallest number is (), and the largest number is (). 5: Uncle Li has cultivated 500 seeds this year, 480 of which have germinated. The germination rate of these seeds is (). 6: The surface area of a cube block with an edge length of 6 decimeters is () square decimeters. Cut it into the largest cylinder with a volume of () cubic decimeters. 7: Statistical chart () should be selected to calculate the change of daily average temperature in a week. 8: The acute angle of a right triangle is 20 ° and the other is (); the apex angle of an isosceles triangle is 130 ° and its base angle is () 9: 3 tons 25 kg = () kg 2.45 hours = () minutes 7 liters 50 ml = () cubic decimeters 44000 square meters = () hectares 10: Given that a = 2 × 3 × 5, B = 2 × 3 × 3, the greatest common divisor of a and B is () and the least common multiple is ().
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