if i wash 3 cars i get 1 dollar so how many cars would i have to wash to get 300 dollars

Question

i dont get it

Answer 1

3/1 = c/300

 

Cross multiply.

 

c = 900 cars

Answer 2

So you should set up a ratio,

 

3 cars = 1 dollar. to get 300 cars multiply both sides of the equation by 100. In other words 100(3 cars)=100(1 dollar).

 

Then this gives us 300 cars=100 dollars