Question

Complete the series. 9 = 4, 21 = 9, 22 = 9, 24 = 10, 8 = 5, 7 = 5, 99 = 10, 100 = 7, 16 = ?, 17 =?

Answer 1

just simply count the number of letters in each number, that is to say:

NINE= 4 letters

TWENTY-ONE= 9 letters

so 16=7 since

SIXTEEN is 7 letters

and 17=9 since

SEVENTEEN is 9 letters