Situation: Priya, Mai, and Lin went to a cafe on a weekend. Their shared bill came to $25. Each student gave the waiter a $10 bill. The waiter took this $30 and brought back five $1 bills in change. Each $3 student took $1 back leaving the rest $2 as a tip for the waiter. As she walked away from the cafe, Lin thought, "Wait-this doesn't make sense. Since I put in $10 and got $1 back, i ended up paying $9. So did Mai and Priya. Together, we paid $27 then we left a $2 tip. that makes $29 total. And yet we originally gave the waiter $30. Where did the extra dollar go?"
This was taken almost verbatim from open up resources, grade 6 mathematics, unit seven, page 32
