Question

A bag contains 8 black marbles, 16 white marbles, 14 red marbles, and 10 green marbles. A marble is drawn at random from the bag. What is the probability that the marble drawn will not be white?
A.1/3
B.2/3
C.3/4
D.15/16

Answer 1

You can approach this question in multiple ways, 2 of which are more obvious. 

Method 1). Add up the number of marbles which aren't white divide that by the total number of marbles. 
I.e. 8 + 14 + 10 = 32
32/48 = 2/3
[There are 48 marbles in total]

Method 2). Find the total number of marbles, divide the number of white marbles by the total (like method 1), then do 1 minus the answer. 
I.e. 16/48 = number of white marbles
1 - 16/48 = 2/3 

Answer 2

C. is the answer to the problem