Question

Ross read that, in 1900, the 10,700,000 teens living in the United States made up 14% of the population. Using this data, he wants to find the population of the United States in 1900. Which picture and equation best represent the problem?

Answer 1

This is the equation for the problem
$\frac{14}{100} = \frac{10700000}{ x}$
and if you want to find x (the population of America in 1900 :
$x = \frac{10700000 \times 100}{14} \\ = \frac{1070000000}{14} = 76428571$
the population of America in 1900 was 76,428,571