One-seventh of 28 is 4.
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28 is a factor of 56, and 28 is also a factor of itself. So the highest common factor of 28 and 56 is 28.
28 + 28 = 56
7x4 equals 28.
28 decreased by 25 percent = 21= 28 - (25% * 28)= 28 - (0.25 * 28)= 28 - 7= 21
1 x 28 = 282 x 28 = 563 x 28 = 844 x 28 = 1125 x 28 = 1406 x 28 = 1687 x 28 = 1968 x 28 = 2249 x 28 = 25210 x 28 = 280