Problema Solution
In 2010, the number of Americans 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 American were health club members in 1990?
Answer provided by our tutors
a 100% increase is 2x, a 119% increase is "2x + 0.19x":
2x + 0.19x = 45.3
2.19x = 45.3
x = 45.3/ 2.19
x = 20.6849
there were 20.68 milliion health club members in 1990