One cup.
Lets look at it in parts.
If I have two cups, have of two is one. Take two Twinkies cut each in half, and you still have one whole Twinkie to give someone.
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1 1/2 cups + 1 1/2 cups = 3 cups.
If you double 1 1/2 cups, then you get 3 cups.
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Oh, dude, half of three and a half cups is like... one and three-fourths cups. It's not rocket science, just divide that bad boy in half and you're good to go. So, if you need to measure out half of three and a half cups, just grab yourself a cup and three-fourths measure and call it a day.
Dividing 3 cups of flour in half would give you 1.5 cups of flour. This is because half of 3 is 1.5. To divide a number by 2, you simply cut the number in half. In this case, half of 3 cups is 1.5 cups.