Someone puts table tennis balls into two kinds of boxes. Each big box contains 12 balls and each small box contains 5 balls. If there are 99 balls and the number of boxes is more than 10, how many balls are in each big box and small box? (explain the reason)

Someone puts table tennis balls into two kinds of boxes. Each big box contains 12 balls and each small box contains 5 balls. If there are 99 balls and the number of boxes is more than 10, how many balls are in each big box and small box? (explain the reason)

Let x balls be used in large box and Y balls be used in small box. 12x + 5Y = 99 x + Y > 10. According to the principle of integral division, 99 balls are odd, indicating that the small box is odd, and the last number of balls in small box is 5. Then the last number of balls in large box is 4, and the last number of balls in large box is 2 or 7