There are people who helped you a long time ago, and this generation has to take it out and count?

Hello: Yes (8 5-4 5) 1 3=4 5 1 3=12 5 If you don't understand anything about this question, you can ask it, if you are satisfied, please click "Choose as a satisfactory answer".

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8 5 is 4 5 more than 1 3 of a number, and this number is (8 5-4 5) * 3 = 12 5

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Let a 30% alcohol solution be 1, then the alcohol is, add water x, then, x=, plus the same amount of water, alcohol is, then the total amount is 1+, that is, 20%.

20%, let x be added then 30 (100+x) = 24% (may as well be set to have a solution of 100) then x = 25, so there is an answer (30 (100 + 25 + 25)).

One, A, and have traveled in opposite directions from two places at the same time, and after 9 minutes of meeting, the speed ratio of A and B is 2:3, so what is the speed of A and B?

speed sum = kilometers per hour;

So A velocity = 30 2 (2+3) = 12 km/h;

B speed = 30-12 = 18 km/h;

two, a manuscript has a total of 360 pages, A alone needs 8 hours to complete, has been alone to complete 10 hours to complete, two people cooperate, if you want to complete at the same time, how to assign tasks?

Set up page x, there is:

x/(1/8)=(360-x)/(1/10);

8x=3600-10x;

18x=3600;

x=200;

So A is 200 pages, B is 360-200 = 160 pages.

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The sum of the results of the two people of A and B is: 2*80=160 Let the average score of C, D, and F is: X, A, B, C, D, and F, and the results of the five people are: 160+3X

160+3x) 5=x-5 x=So the average score of the five people is:

Solution: Suppose the average score of the five people is x

5x=80*2+3(x+5)

The solution is x=

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