20, 40, 60, 80, 100, 120 and so on.
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20s is correct.
20s
16s + 4s = 20s
To find out how many 20s are in 420, you divide 420 by 20. This calculation gives you 420 ÷ 20 = 21. Therefore, there are 21 instances of 20 in 420.
320