20c = 1 whole. 80c = 4 whole.
16c = 4/5 whole.
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Assuming counters = C. 12C = 3/4set. 48C = 3set. 16 = 1 Set.
3/5 * 15 = 9
1/9 would be 2, so 7/9 would be 14.7/9 of 18 = 14 counters.
9/3*5=15
If you're asking what 1/4 of 12 is: 12 * 0.25 = 3 3 * 4 = 12 3 + 3 + 3 + 3 = 12