Question

549 vehicles in 9 acres. How many in 1 acre?

Answer 1

We have that there are 549 vehicles in 9 acres, we want to know how many are in 1 acre. We see that those quantities are proportional and therefore:

$v=\frac{549\cdot1}{9}\Rightarrow v=61$

We will have that there are 61 vehicles in 1 acre.