<human>:  Heather is going to sew 150 aprons that are to be used for a kiddie crew program. She already was able to sew 13 aprons, and today, she sewed three times as many aprons. How many aprons should she sew tomorrow if she wants to sew half of the remaining number of aprons needed?
<bot>: How many aprons did Heather sew today? ** Heather has sewn 13 x 3 = <<13*3=39>>39 aprons today.
How many aprons did Heather sew in total? ** The total number of aprons sewn is 13 + 39 = <<13+39=52>>52.
How many aprons does Heather need to sew? ** Heather needs to sew 150 - 52 = <<150-52=98>>98 aprons more.
How many aprons should Heather sew tomorrow? ** So, she needs to sew 98/2 = <<98/2=49>>49 aprons tomorrow.
#### 49