Assuming that 100 baht is converted into RMB 19.67, then 5,000 yuan can be converted into RMB 254 19.42. Let me tell you how to solve this problem:

19.67 yuan convertible 100 yuan.

Then 1 yuan can be exchanged for 100÷ 19.67 yuan, and 5000 yuan can be exchanged for100 ÷19.67 * 5000 = 25419.

In addition, because the exchange rate is different every day, 19.67 is also a number that changes with the exchange rate. You just need to learn how to calculate it and put it into the formula.