Sara sent letters to her friend in China every month. She sent 6 letters in January, 9 letters in February, and in March she sent triple the number of letters she sent in January. How many letters does Sara send?
Let's be accurate as possible and think first.
33
Combining January and February, Sara sent 6 + 9 = 15 letters.

In March, she sent 3 * 6 = 18 letters.

Altogether, Sara sent 15 + 18 = 33 letters.

.

Thus, the answer is 33