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?
Heather has sewn 13 x 3 = <<13*3=39>>39 aprons today.
The total number of aprons sewn is 13 + 39 = <<13+39=52>>52.
Heather needs to sew 150 - 52 = <<150-52=98>>98 aprons more.
So, she needs to sew 98/2 = <<98/2=49>>49 aprons tomorrow.
#### 49