Use proportions to solve this problem. Assign a variable to the unknown number of teaspoons of cinnamon.
For this case, we will use the variable n.
Multiply both sides by 2.
Multiply both sides by 13.
Divide by 2 on both sides.
Remember to use the conversion factor to determine how many tablespoons and teaspoons Ms. B will need.
19.5 = 2n