Since 1 British Pound is equal to 161.40858641117384 Japanese Yens, we could say that n British Pounds are equal to 161.40858641117384 times n Japanese Yens. In other words, we could use the following formula:
Japanese Yens = British Pounds x 161.40858641117384
For example, let's say that we want to convert 2.0 British Pounds to Japanese Yens. Then, we just replace British Pounds in the abovementioned formula with 2.0:
Japanese Yens = 2.0 x 161.40858641117384
That is, 2.0 British Pounds are equal to 322.8171728223477 Japanese Yens.