In a box of markers there are eight which have dried up and will not write. The box contains 15 red, 15 purple, 5 black and 10 white markers. A marker is picked at random from the box.
Find the probability that
a) it is red
b) it is not black
c) it is purple or white
d) it is orange
e) it is neither black or white

Fun problem. We help but don't do homework for people.

What grade are you in? Did you start by adding all of them for a total?