To the nearest million, the number of households in the U.S. having television sets was 4 million in 1950 and 76 million in 1980. Express the first number as a fraction of the second.
(76-4)/(1980-1950)
72/30 =12/5
in the book they have the answer as 1/19, how do you get that?
I think Kuai misread your problem.
4/76 = 1/19