move one unshaded counter to the 3rd dish that only has two circles in it. You have 12 total counters ..9 are shaded 3 are not. fractions would be 9/12 and 3/4 (9 counters are shaded out of 12 total counters) and (3 dishes out of 4 are shaded)
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16 counters is 4/5 of all 20 counters.16/20
It is 12 counters
Assuming counters = C. 12C = 3/4set. 48C = 3set. 16 = 1 Set.
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