Answer:
Both because they're basically the same thing ;-;
Step-by-step explanation:
1) 23.33 - 15.59 = 7.29
7.74/6 = 1.29 So he bought 1 soda ;-;
2) 15.59 + 6c = 23.33 - Subtract 15.59 from both sides:
6c = 7.74 - Divide both sides by 6
c = 1.29 So he bought 1 soda again
The rest of the money is probably the tax so ;-;
Good luck and hopefully I helped!