Lila earns 8.75/h at her job. how many hours must lila work to earn 105$.

Lila must work 12 hours to earn $105.

The formula will be of direct variation. Wherein one variable directly varies to the changes of the other variable in a constant ratio.

y = kx
y is the total value; the variable that directly varies to x.
k is the  constant value
x is the variable that changes

105 = 8.75x
105/8.75 = 8.75x / 8.75
x = 12 hours

If you would like to know how many hours must Lila work to earn $105, you can calculate this using the following steps:

$8.75 ... 1 hour
$105 ... x hours = ?

8.75 * x = 1 * 105
8.75 * x = 105      /8.75
x = 105 / 8.75
x = 12 hours

Result: Lila must work 12 hours to earn $105.

Just a second zzz

There is 240 red cars and there is 400 blue cars because 240/3=80 and 80*5=400