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Yes. It can be divided into -- 21 equal groups of 1 each -- 3 equal groups of 7 each -- 7 equal groups of 3 each
Yes, 21 can be divided into equal groups. 21 is divisible by 1, 3, 7, and 21. Therefore, you can divide 21 into 1 group of 21, 3 groups of 7, 7 groups of 3, or 21 groups of 1, with each group being equal in size.
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6/7 = 18/21 + 1/21 = 19/21
3.3333