A bag contains 7 red marbles, 12 orange marbles, 18 yellow marbles, and 5 purple marbles. A marble is drawn at random from the bag.

What is the probability that the marble drawn will not be orange?
5/7 , 1/30 , 2/7 , 1/12

Question

A bag contains 7 red marbles, 12 orange marbles, 18 yellow marbles, and 5 purple marbles. A marble is drawn at random from the bag. 

 

What is the probability that the marble drawn will not be orange?
5/7 , 1/30 , 2/7 , 1/12

anonymous · Answer

@aum

aum · Answer

Find total number of marbles.
Number of non-orange marbles = Total number of marbles - No. of orange marbles.

Probability of picking a non-orange marble = 
Number of non-orange marbles / Total number of marbles

anonymous · Answer

total number of marbles is 42. number of non-orange marbles is 31.

anonymous · Answer

@aum ok, I did that, not im confused

anonymous · Answer

sorry, I'm terrible at this :/

aum · Answer

total number of marbles is 42 is correct
number of non-orange marbles is 42 - 12 = 30

anonymous · Answer

oh! okay so would it be 1/30? or no?

aum · Answer

Probability of picking a non-orange marble = 
Number of non-orange marbles / Total number of marbles = 30 / 42 = 5 / 7

anonymous · Answer

thank you so much