Before hosting their annual Chess Tournament and Spelling Bee, a school received 7 boxes of honorary medals: one medal for every participant. After Chess Tournament, two boxes were empty and the rest were still closed. After the Spelling Bee, which had twice as many participants, there were 72 medals left. How many people competed in Chess Tournament?

1 answer

the Spelling Bee used twice as many boxes as the Chess Tournament

that left one unopened box remaining ... 72 medals per box

two boxes for the Chess Tournament ... (2 * 72) medals and competitors