When he placed them in groups of 2, there was one watermelon left over. When he placed them in groups of 3, there was one watermelon left over, The same thing happened when he put it in groups of four, groups of 5, or groups of 6. But when he put it in groups of 7, he ended up with complete groups of 7, with no watermelon left over. Help Mr. Short figure out how many watermelons he started with. Once you have a number that works, explain how you achieved your answer and prove that his clues work.​