Original number = 1674/9= 186.
2. 15 times three digits is exactly the original four digits, so 14 times three digits is exactly the original four digits MINUS three digits, which is exactly the whole thousand. Only 7000 divided by 14 can get an integer equal to 500, so the four digits are 7500.
3. If everyone is divided into three parts, there will be 16 more apples; If everyone is divided into five, there will be four fewer apples, that is to say, everyone will be divided into three apples, more than 16 apples, and then the remaining 16 apples will be divided into two, which can be divided into eight people, that is, eight people will have five apples each, and there will be four fewer apples, that is, two people.
So * * * has 10 people and 45 apples.