11 and 3/4 gallons of gas
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12 minus 11 1/6 is 5/6
5/6 − 1/12 = 3/4
The way to figure this out is to convert the whole number into a fraction with the same denominator as the fraction being subtracted. Let's do this one. 1 - (5/12) = (12/12) - (5/12) = At this point, you have 12 over 12 minus 5 over 12, and to work a fraction like that where you have a common denominator, you can take the numerators and subtract them and put the result over 12. It will look like this: (12 - 5) / 12 = 7/12 That 7/12 is your answer. You don't even have to reduce it.
Y - 12 < -10 Add 12 to both sides: Y < 2
1 = 12/12 12/12 - 5/12 = 7/12