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In a bag of keys, there are 12 silver keys, 5 black keys, 10 copper keys, and 3 painted keys of various colors. One key is drawn out at random. What is the probability that the key that is drawn is silver
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In a bag of keys, there are 12 silver keys, 5 black keys, 10 copper keys, and 3 painted keys of various colors. One key is drawn out at random. What is the probability that the key that is drawn is silver or copper?

User Alganet
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1 Answer

3 votes

12+5+10+3=30 <-- the number of all keys

12+10=22 <-- the number of silver and copper keys

The probability is
(22)/(30)=(11)/(15)
User Biggates
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