There are twenty alphabet cards in a big bag. If the probability of pulling a vowel is 1 out of 5, how many consonant cards are there? If the probability is 1 out of  5, it might be that the answer 3.

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If 1 out of 5 is a vowel, then 4 out of 5 are consonants. Now you have to set your 1 out of 5 equivalent to something out of 20 (your total number of cards) so 4 out of 20 will be vowels and 16 of 20 are consonants. (because 4 + 16 = 20) :)

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