Answer: 26 sodas.
Explanation:
 Let be "x" the number of regular sodas that were sold in that day.
 You know that the the ratio of diet sodas sold to regular sodas sold was:
 

 This ratio can also be written as a fraction:
 

 Knowing that in that day they sold 14 diet sodas, you can write the following proportion:
 

 Now solve for "x":
 

 Then the total number of sodas sold that day is:
 
