Hello, this is a question about the exchange rate pricing method in the foreign exchange market. The pricing method can be expressed by mathematical formula, so it is easy to understand.

There are two exchange rate pricing methods in the foreign exchange market:

Direct quotation: if USD is against RMB; Dollar against Japanese yen; USD /HKD, etc. ;

Indirect pricing method: such as euro against dollar; Sterling against the dollar; Australian dollar against the US dollar, etc. ;

For example, the USD/HKD is a direct quotation, and the mathematical formula is USD/HKD; ; GBP/USD is an indirect pricing method, and the mathematical formula is GBP/USD, so what you want is the mathematical formula of cross dialing GBP /HKD = USD /HKD * GBP/USD.

I hope it helps you.