Question

Jamaal has 20 models of planes and cars. He has three times as many cars as planes. What is the ratio of his cars to total models?1:43:13:44:3

Answer 1

We know that

There are 20 models in total.

He has three times as many cars as planes.

The first statement can be expressed as

`x+y=20`

The second statement can be expressed as

`y=3x`

Where y represents cars and x represents planes.

Now, we combine the equations

`\begin{gathered} x+y=20 \\ x+3x=20 \\ 4x=20 \\ x=(20)/(4) \\ x=5 \end{gathered}`

Then, we find y

`y=3\cdot5=15`

As you can observe there are three times more cars than planes, which means the ratio is 3:1.