Answer: 33.32% or 33.2% ( depending on rounding ) chance that the a will decide to use a slide if they pick at random.
Explanation:
2 slides + 3 swings + 1 monkey bars = 100%
There are 6 items in total so 100/6= 16.66 or 16.6.
Since there are 2 slides multiply the chance for each by 2, 16.66 or 16.6 * 2 = 33.2% or 33.32%