Since 1 Hong Kong Dollar is equal to 19.80672684127936 Jamaican Dollars, we could say that n Hong Kong Dollars are equal to 19.80672684127936 times n Jamaican Dollars. In other words, we could use the following formula:
Jamaican Dollars = Hong Kong Dollars x 19.80672684127936
For example, let's say that we want to convert 2.0 Hong Kong Dollars to Jamaican Dollars. Then, we just replace Hong Kong Dollars in the abovementioned formula with 2.0:
Jamaican Dollars = 2.0 x 19.80672684127936
That is, 2.0 Hong Kong Dollars are equal to 39.61345368255872 Jamaican Dollars.