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

Question

On behalf of Sture Sjöstedt

Answer 1

ans is- 16=7, 17=9;
logic is- in 9= "nine", letters in this word=4 so =4
and 99="ninetynine" , letters in this word=10 so =10,
hence,
16= "sixteen" = 7
17="seventeen"= 9