Flowers in a Garden

A garden has two types of flowers: roses and tulips. The total number of flowers in the garden is 240.

There are three times as many tulips as roses. If the roses are represented by the variable $r$ and the tulips by the variable $t$, we can express the relationship between them with the following equations:

$$ t = 3r $$

$$ r + t = 240 $$

Using this information, determine the number of tulips in the garden.