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5/8 because their is 8 letters and there is 3 that you underlined vowels 5 of them are not a vowel 
There are 8 letters in the word 'mushroom'. Out of these letters, 3 are vowels and the other 5 are consonants (not vowels). Therefore, 5/8 of the letters in the word 'mushroom' are not vowels.
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