1/3 chances the bubblegum is blue. To solve this problem you add all of the bubblegum together so 25+20+15 to get 60 then express it as a fraction to show only the blue pieces which would be 20/60 and you can simplify it to 1/3 or 33.33%
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Step-by-step explanation:

reduced
transformed the expression to make it easier
add
reduce
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I plotted it out on the graph and here it is:
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Step-by-step explanation:
25