4 cups
In US measure, 1 pint = 2 cups And 1 cup = 0.5 pint.
There are 16 US fluid ounces, 2 cups in 1 US pint (473.2 ml).
Although there are 20 Imperial fluid ounces in 1 Imperial pint (568.3 ml), the Imperial system does not have cups, so it is best to use half pints.
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There are 2 pints in 1 cup.
1 pint = 2 cups 2 pints = 4 cups 3 pints = 6 cups . . . 31 pints = 62 cups
There are 42 cups in 21 pints. One pint is equal to 2 cups. So, to find the number of cups in 21 pints, you can multiply 21 pints by 2 cups.
There are 21 pints in 42 cups. Each pint is equal to 2 cups, so to convert cups to pints, you divide by 2.
2 and 1/2 cups = 1 and 1/4 pints