SOLUTION: What is the probability of drawing a yellow marble or a red marble from a bag containing 12 yellow marbles, 16 red marbles, and 15 green marbles?

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Question 100998: What is the probability of drawing a yellow marble or a red marble from a bag containing 12 yellow marbles, 16 red marbles, and 15 green marbles?

Answer by doukungfoo(195) (Show Source):
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First find the total number of possible outcomes. This is the total number of marbles in the bag.
12+16+15=43
So the total number of possible outcomes is 43
Next find the total number of favorable outcomes. In this problem favorable outcomes are drawing a yellow or a red marble from the bag. There are 12 yellow and 16 red marbles in the bag. so...
12+16=18
So the total number of favorable outcomes is 16
Now express the probability of drawing a yellow or red marble as a fraction.

If you are able to reduce the fraction go ahead and do that to get your final answer. In this case 16/43 does not reduce so...
The probability of drawing either a yellow or red marble from the bag is

Note: you can also express probability as a percentage. Do this by dividing 16/43 and multiply by 100.
16/43=0.372093023... *100 = 37% (rounded)