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12. 252 / 21
Four sevenths of 21 is 12.
21 = (.12)(x) 21 / .12 = x Answer: 175
There are 12 inches in one foot. Therefore, 21 inches is equal to 21/12 = 1.75 feet.
If you want the "greatest", then there can only be one of it.You can't have two different numbers and say that they'reboth the "greatest".The greatest common factor of 12 and 21 is 3 .