Question

Complete the series

9 = 4, 21 = 9, 24 = 10, 8 = 5, 7 = 5, 99 = 10 ????

Answer 1

9 = 4, 21 = 9, 24 = 10, 8 = 5, 7 = 5, 99 = 10
because we count the letters not numericals
nine=4, twenty one= 9

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