The common denominator is 20.
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Answer:
20
5 x 1 =5 4 x 1 = 4
5 x 2= 10 4 x 2 = 8
5 x 3 = 15 4 x 3 = 12
5 x 4= 20 4 x 5 = 20
Step-by-step explanation:
