Got 14 with same approach as others! Seems intuitive and easy!

Though I was thinking can there be another approach! I can not use such simple calculation for such questions for example if it's 1:100 and 5^k than what!

So was thinking as follow

in 1: 30.... 10 No divided by 3

in 1: 30, ...9,18,27......3 No divided by 3*3

in 1:30....27....1 No divided by 3*3*3

total 10+3+1 = 14

This works for 1:100 divided by 5

1:100.... 20 divided by 5

1:100.... 4 divided by 5*5

total 24 !

Do you see any major flow in this method! (Except, I myself prefer first method over this, just because itâ€™s intuitive, and I can not derive such method in exam..