Henryâs aunt buys him an enormous amount of trucks to add to his miniature car collection. Join Mrs. LaFont to find out how many trucks she buys him and have some fun with two brain teasers! For this lesson you will need a pencil and the lessonâs Problem Set. The homework sheet will be used for the brain teaser and is optional. You can access the Problem Set and the homework sheet using the links below the video.