Since 1 British Pound is equal to 21.06797542408146 Mexican Pesos, we could say that n British Pounds are equal to 21.06797542408146 times n Mexican Pesos. In other words, we could use the following formula:
Mexican Pesos = British Pounds x 21.06797542408146
For example, let's say that we want to convert 2.0 British Pounds to Mexican Pesos. Then, we just replace British Pounds in the abovementioned formula with 2.0:
Mexican Pesos = 2.0 x 21.06797542408146
That is, 2.0 British Pounds are equal to 42.13595084816292 Mexican Pesos.