Detailed Instructions: You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Problem:on the day of the awarding ceremony robyn and lucy decided to sell more cookies during the morning to make sure they get the badge . lucy sold 19 packs and robyn sold 16 how many packs did they sell on their last day ?
Solution:
35