The number of terms is:
(200 - 1): 1 + 1 = 200 (number)

We have:
From 1 to 9 have a two digit number
From 10 to 100 has 19 digits two
From 101 to 200 there are 20 digits two
So 1 to 200 are: 1 + 19 + 20 = 40 digits 2
=> Yes: 200 - 40 = 160 with no 2 digits

Answer: 160

The sum of the equal parts is:
3 + 8 = 11 (part)
Baby number is:
198: 11 x 3 = 54
Large numbers are:
198 - 54 = 144
Answer: SB: 54
                 SL: 144

b3 = 3375 = 153 => b = 15 => a = 13 ; c = 17 => ac = 221

The odd number between the six remaining numbers is:

1337 : 7 = 191

So 7 consecutive numbers are 185 ; 187 ; 189 ; 191 ; 193 ; 195 ; 197