Answer:
83%
Step-by-step explanation:
The first thing you need to calculate is how much less time she plays per day.
3 hours - X = 30 minutes
x = 2.5 hours
Now that you know how much time has decreased, you need to figure out what percent of the original time the decreased time is.
In other words, decreased time = x * 3 hours
Plug in the decreased time to get:
2.5 hours = x * 3 hours
x = 2.5/3
x = 0.83333333333333 = 83.333333% rounds to 83%.
Therefore, 30 minutes is a 83% decrease in playing time from the original time of 3 hours.
