There is a total of 120 marbles in a box, each of which is red, green, blue, or white. If one marble is drawn from the box at random, the probability that it will be white is 1/4 and the probability that it will be green is 1/3. What is the probability that the marble will be either red or blue ? Choose the correct choice.
A) 1/6  B) 1/4  C) 2/7  D) 1/3  E) 5/12
Total marbles in the box=120   white marbles=120/4= 
<gadget id="calculator">120/4</gadget>
<output>30</output>
30   green marbles=120/3= 
<gadget id="calculator">120/3</gadget>
<output>40</output>
40   w+g=70   red+blue=50   p(red or blue)=50/120=5/12   ANSW5/12R:5/12
<result>E</result>
There is a total of 120 marbles in a box, each of which is red, green, blue, or white. If one marble is drawn from the box at random, the probability that it will be white is 1/4 and the probability that it will be green is 1/3. What is the probability that the marble will be either red or blue ?