Final answer:
Stanley needs 18 additional sticks of butter to bake a total of 49 cakes.
Step-by-step explanation:
To find out how many additional sticks of butter Stanley needs to bake a total of 49 cakes, we need to determine the number of cakes he can bake with each stick of butter. Given that he can bake 2 cakes with each additional stick of butter, we can set up an equation to solve for the number of sticks needed. Let x be the number of additional sticks of butter.
13 + 2x = 49
Subtracting 13 from both sides gives us:
2x = 36
Dividing both sides by 2, we find that x = 18.
Therefore, Stanley needs 18 additional sticks of butter to bake a total of 49 cakes.