Answer:

Explanation:
First, let's find how many total items there are in the box.
If there are 20 oranges and 10 grapes, then there are
items in the box.
Now, if there are 10 grapes in this box, we know that the probability of picking a grape is
because the total is the denominator and the number of items for that selection is the numerator.
We can simplify this fraction down to
.
Hope this helped!