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4-58.

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