1, solution: make clothes worth x silver coins. From the meaning of the title, it means: (x+2)÷(x+ 10)=7/ 12, and the solution is x=46/5, which means that the clothes are worth 46/5 silver coins.

2. Solution: Let the price be X yuan, that is, (90% x-250) ÷ 250 = 15.2%. The solution means that x=320 yuan, that is, the price is in 320 yuan.

3. Solution: If there are x products in each box, the meaning of the problem is: (8x+4) ÷ 5 = (11x+1) ÷ 7+1,and the solution is x =1.

4. Solution: Let the speed of the two cars be equal after x hours, and the speed at this time is (30+20x) km/h/h. From the meaning of the question, it is 30+20x=90- 10x, and the solution is x=2, (30+20x)=70, that is, the speed of the two cars is equal after 2 hours, which is 70.

5. Solution: Since S = 1/2gt 2, if t=2 and s= 19.6 are brought into the original equation: 19.6= 1/2g×4, the solution is g=9.8. When t=3, t will be

6. Solution: Let the fast horse catch up with the slow horse in x days. The question means: (12+x) 150=240x, and the solution is x=20, that is, the fast horse can catch up with the slow horse in 20 days.

7. Solution: Let's meet for the first time in X minutes and meet again in Y minutes.

Because whether we meet for the first time or for the second time, two people have to walk together. This question means:

(350+250)x=(350+250)y=400，x=y=2/3。 That is, we met for the first time after 2/3 minutes and met again after 2/3 minutes.