In 2010 the number of amercians who were members of a health club was 45.3 million. This was an increase of 119% from the number of health club members in 1990. How many americans were health club members in 1990?

solution -  X + (119/100)*X = 45.3

100X + 119X = 4530

219X = 4530

X = 4530/219 = 20.68 MILLION in 1990 answer