Solution:
Let's reread the part of the question carefully.
{one more} {than one third the number of dolls than Sally has}
↥ ↥
1 s/3
This means that Anne has s/3 + 1 dolls, which is 9 dolls.
- => s/3 + 1 = 9
- => Sally/3 + 1 = Anne
Hence, the equation that represents the word problem is S/3 + 1 = A.