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1. A project! Team a will do it alone, and it will be completed within the specified date! If team B will do it alone, it will take more than 3 days. Now team B will do it alone two days later, and it will be completed within the specified date! Question: what is the specified date? 2. Make a new coating with 100 yuan a coating and 240 yuan B coating! The total value remains unchanged! The new coating is sold 3 yuan less per kilogram than a coating and 1 yuan more than B coating per kilogram! What's the price of this new coating? Drought is coming! A middle school donated 1800 yuan to class a of Grade 8, and 1560 yuan to class B. It is known that class A is 1.2 times the average donation of class B, and class B has 2 more people than Class A. how many people are there in each class?
Set the date X days
X / 1 a day, x + 3 / 1 b day
∴x/1×2+x+3/1×2+x+3/1×（x-2)=1
Self solution, and homework, first solve a problem
Junior high school mathematics fractional equation to solve applied problems
In the first month when a shopping mall sells a certain commodity, it makes a profit of 6000 yuan by increasing the purchase price by 20%. In the second month, the shopping mall carries out promotion activities and increases the purchase price by 10%. The sales volume in the second month increases by 100 pieces in the first month, and the profit in the second month is 2000 yuan more than that in the first month, How much is the purchase price of this product? How many pieces are sold in the second month?
Let only one unknown number be solved by fractional equation
Let the purchase price be x yuan
(6000/20%x)+100=(6000+2000)/10%x
30000/x+100=80000/x
X = (80000-30000) / 100 = 500 yuan
Second month sales: 8000 / (500 * 10%) = 160 pieces
A: the purchase price of this product is 500 yuan, and 160 pieces are sold in the second month
A piece of iron wire is 37.68 meters long, and it is wound 200 times on a round wooden stick. What is the radius of the cross section of the wooden stick?
How many square centimetres is the cross-sectional area of a big tree that is 100 meters long and less than 48 centimetres around 20 circles?
1. Perimeter = 3768 △ 200 = 18.84 cm
Radius = 18.84 △ 3.14 △ 2 = 3cm
2. Perimeter = (100 + 0.48) △ 20 = 5.024m = 502.4cm
Radius = 502.4 △ 3.14 △ 2 = 80cm
Cross sectional area: 80 & # 178; × 3.14 = 20096 square centimeter
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