Since 1 British Pound is equal to 19.8105621175 South African Rand, we could say that n British Pounds are equal to 19.8105621175 times n South African Rand. In other words, we could use the following formula:
South African Rand = British Pounds x 19.8105621175
For example, let's say that we want to convert 2 British Pounds to South African Rand. Then, we just replace British Pounds in the abovementioned formula with 2:
South African Rand = 2 x 19.8105621175
That is, 2 British Pounds are equal to 39.621124235 South African Rand.