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?
Combining January and February, Sara sent 6 + 9 = <<6+9=15>>15 letters.
In March, she sent 3 * 6 = <<3*6=18>>18 letters.
Altogether, Sara sent 15 + 18 = <<15+18=33>>33 letters.
#### 33