Answer: There are 30 batches of barbeque sauce that she can make by using the spice mixture.
Explanation:
Since we have given that 
Number of tablespoons of her spice mixture = 

Number of tablespoons to make a batch of barbeque sauce = 

so, the number of batches of barbeque sauce would be 

Hence, there are 30 batches of barbeque sauce that she can make by using the spice mixture.