It is a mathematically true statement. It is grammatically incorrect.
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28
1 and 28 2 and 14 4 and 7
1 & 28, 2 & 14, 4 & 7
84
You first of all divide 28 by 4 to get 7. This is one fourth of 28. Multiply the 7 by 3 to get 21 . 21 is three fourths of 28