You are given a math word problem and you are supposed to apply multiple mathematical operators 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.

carol was sending out birthday invitations to her friends . if each package of invitations she bought had 9 invitations in it and she bought 5 packs how many friends can she invite ?
45

tiffany was buying hand towels for her house . she bought 9 packs with each pack having 3 towels in it . how many towels did she buy ?
27

there are 5929 skittles in steven 's skittle collection . steven also has 11 erasers . if the skittles are organized into 77 groups how big is each group ?
77