In fact, one of the sulfurs has replaced an oxygen. In
Anyway, to your problem:
Both (i) and (ii) are balanced with respect to mass and charge (as they must be!), and, conveniently, we don't have to cross multiply because 4 electrons are involved in each reaction.)
So, what do you observe? Treatment of thiosulfate with strong acid should result in a fine white precipitate of elemental sulfur (reduction), and also the formation of (acrid)
Do I win £5-00?