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1. The minute hand of a clock is 8 cm long. From 1:00 to 3:00, how many centimeters has the point of the minute hand increased? How many square centimeters has the area swept by the minute hand? 2. It's a figure, a circle with a square inside. The diameter of the circle just divides the square into two triangles. The diameter of the circle is 6cm. How about subtracting the remaining area of the square from the circle?
1、2*3.14*8*2 2*3.14*8*8*2
2、2*3.14*3*3-3*3*2
Solve a math problem! It has to be - it has to be solved in proportion
There are two classes a and B in a school, with a ratio of 5:4. The passing rate of class A is 80%, and that of class B is 75%
1. If only 49 students in the whole school pass, how many students in grade a pass
2. Calculate the passing rate of two classes (proportional solution)
It's a proportional solution. It's a positive or negative proportional solution. It's not an equation~~~
(1) Suppose that the total number of class A is 5x and the total number of class B is 4x, then the number of class a passing is 80% x5x = 4x, and the number of class B passing is 75% x4x = 3x, then 4x3x = 49. The solution is x = 7, so there are 4x = 4x7 = 28 in class a passing. (2) because the total number of class A is 5x = 5x7 = 35 and the number of class B is 4x = 4x7 = 28, there are 3528 = 6
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