In a small town, the ratio of bicycles to cars is 4:3. If there are a total of 280 vehicles in the town, how many bicycles are there?
Let the number of bicycles be represented by $b$ and the number of cars by $c$. According to the information given, we can set up the ratios and equations as follows:
$$ \f\frac{b}{c} = \f\frac{4}{3} $$
and also
$$ b + c = 280 $$