Question

Luann predicted that if a certain number of vehicles passed by her by, 42 of them would be SUVs?What was the certain number of vehicles she had in mind.

Types of Vehicles| Number of vehicles

---

     Car               |   6
   Truck              |   10
     SUv              |     14
  Minivan          |     15

Answer 1

135

Explanation:

For every 45 vehicles that pass by, 6 are expected to be cars, 10 trucks, 14 SUVs and 15 minivans.

This means that `14/45` of the cars are expected to be SUVs.

So how many cars have passed by if Luann sees 42 SUVs pass by? We can find that by looking at a ratio:

`"predicted SUVs"/"predicted vehicles"="actual SUVs"/"actual vehicles"`

We know 3 of the values:

`14/45=42/"actual vehicles"`

Note that `42/14=3`, and so if we take `45xx3`, we'll see the actual number of vehicles that have passed by:

`"actual vehicles"=45xx3=135`