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There are 108 TV sets of model a and B in the electrical appliance store. It is known that the number of model a accounts for 5 / 9 of the total number. Later, model a sold some. Now the ratio of the number of model a to the total number is 13:25. How many TV sets has model a sold?
No equation solution is needed
In this question, the number of type B TV sets has not changed
How many sets of type B: 108 × (1-5 / 9) = 48 sets
At present, 48 B-type units account for 1-13 / 25 = 12 / 25 of the total
Now the total number is: 48 / 12 / 25 = 100 units
A bought: 108-100 = 8 sets
Xiaohong and Xiaoqiang start from home at the same time. Xiaohong walks 52 meters per minute and Xiaoqiang 70 meters per minute. They meet at a on the way. If Xiaohong starts 4 minutes ahead of schedule and Xiaoqiang walks 90 meters per minute, they still meet at a. how many meters are Xiaohong and Xiaoqiang's homes apart?
Originally, the speed ratio of Xiaohong and Xiaoqiang was 52:70 = 26:35, then Xiaoqiang walked the whole course of 3561 when they met; later, the speed ratio of Xiaohong and Xiaoqiang was 52:90 = 26:45, when they met, Xiaoqiang also walked the whole course of 3561, then Xiaohong walked the whole course of 3561 × 2645 × = 18 after Xiaoqiang started
The perimeter of a runway is 400 meters, r = 44 meters, r = 40 meters. Xiaoming and Xiaogang compete in 400 meters. Xiaoming runs in the inner race and Xiaogang in the outer race. If the end points are the same, how many meters should the two start from
The outer circumference: the inner circumference = R: r = 44: 40 = 11 / 10,
Outside perimeter = inside perimeter * (11 / 10) = 400 * (11 / 10) = 440 meters, 440-400 = 40 meters, starting at a distance of 40 meters, so that you can run the same length
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