Question

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?

A. 3/10
B. 1/10
C. 2/5
D. 1/5

Answer 1

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 % .