A tablespoons is 1.5 ounces. 48 tablespoons would equal 72 ounces, a US cup is equal to 8 ounces. 72 / 8 = 9 cups in 48 tablespoons.
To break down the figures:
one teaspoon equals .5 ounces
3 teaspoons in a tablespoon
.5 * 3 = 1.5 ounces in a tablespoon
1.5 * 48 = 72 ounces
8 ounces per cup
72 / 8 = 9 cups
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