Answered

The students are selling school pencils. If a red or green pencil is pulled from a bag, it is free. The bag contains:


5 red

10 green

15 yellow

20 blue


What is the probability that the first buyer will get a free pencil when randomly drawing one from the bag?

A3/10
B1/10
C2/5
D1/5

Verified Answer :

AL2006


Probability =

       (number of ways to be successful)
divided by
       (total number of things that can happen) .


There are 50 pencils in the bag all together, of all colors.
  
       Total number of things that can happen = 50 .

You get a freebie if you pull a red or a green from the bag.
There are 5 reds in the bag.
There are 10 greens in the bag.

        Number of ways to be successful = (5 + 10) = 15 .

Probability = (15) / (50) =  3/10  =  30 % . 

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