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A gallon jug of milk 3/4. After breakfast the jug 1/12 full. Find the difference of amounts before breakfast and after breakfast

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You'll need to subtract 1/12 from 3/4.  Seeing that 12 is the LCD, convert 3/4 to 9/12.  Subtracting 1/12 from 9/12 results in 8/12, or 2/3 gallon (the amount of milk left after breakfast).
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