Question
Tom folded 20 paper boxes on the first day. Each day he did 7 more paper boxes than the previous day. On the last day, he made 111 boxes. How many days did he fold paper boxes?
2 m

Click button first when a symbol is required. X

Tom folded 20 paper boxes on the first day. Each day he did 7 more paper boxes than the previous day. On the last day, he made 111 boxes. How many days did he fold paper boxes?