The expression is Get the marbles out of your mouth, meaning Speak clearly, or Out with it!. The Greek orator Demosthenes is said to have overcome a speech impediment by speaking over the roar of the ocean with pebbles in his mouth.
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He will have 13 blue marbles and 10 green marbles.
12 blue marbles
24
The fraction is 3/15.
45 __ 91