What are the characteristics of numbers divisible by 2 and 5 at the same time

A number is characterized by a multiple of 10, and a digit is 0

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1. Characteristics of numbers divisible by 2,3,5,9
2. The maximum two digits that can be divisible by 2 and 3 at the same time are () and the minimum two digits that can be divisible by 3 and 5 at the same time are () and () respectively
3. If the sum of the numbers of an integer can be divided by 3 (or 9), then the number must be divided by () or ()
4. How to prove that the sum of each digit of a number can be divided by 3, then the number can also be divided by 3? Please show me the process, don't give me an example But what I want is a general formula, not an example. If it's five digits or six digits (I say a number, you can't be sure it's four digits), you can't prove it in this way
5. If the sum of your numbers can be divided by 9, then the number can be divided by 9. Please explain the reason and give a characteristic that three digits can be divided by 7
6. What are the characteristics of numbers divisible by 3 and 9? Five examples
7. What are the characteristics of numbers divisible by 72
8. Find the sum of numbers from 1000 to 4000 that satisfy the condition that the sum of all factors of the number can be divisible by 3 and 7 at the same time
9. From 1 to 1000, how many numbers can be divided by 3 or 7
10. The number of 2,3,5,7 in 1-1000 How to ask?
11. Write out the characteristics of numbers divisible by 2,3,5 respectively, and write out the characteristics of numbers divisible by 2,3,3,5,2,5,2,3,5 at the same time Write out the characteristics of numbers divisible by 2,3,5 respectively, and write out the characteristics of numbers divisible by 2,3,3,5,2,5,2,3,5 at the same time
12. Xiao Ming is 11 years old and his grandfather is 68 years old. In a few years, his grandfather will be four times as old as Xiao Ming? (equation solution)
13. Grandma is 64 years old and grandson is 13 years old. How many more years will grandma be four times as old as grandson?
14. This year, my grandfather's age is six times that of Xiao Ming. In a few years, my grandfather's age will be five times that of Xiao Ming. In a few years, my grandfather's age will be four times that of Xiao Ming
15. Xiao Ming is 7 years old, and his grandfather is 70 years old. In a few years, will his grandfather be eight times as old as Xiao Ming?
16. When Xiaoming was 9 years old, his grandfather was 60 years old. This year, his grandfather's age is four times that of Xiaoming. How old is his grandfather this year?
17. Xiao Ming, a primary school student, asked his grandfather how old he was this year. He replied, "I am more than seven times your age this year. In a few years, I will become six times your age. In a few years, I will become five times your age. In a few years, I will become four times your age." you said that Xiao Ming's grandfather is () years old A. 60B. 69C. 70D. 72
18. Xiao Ming, a primary school student, asked his grandfather how old he was this year. He replied, "I am more than seven times your age this year. In a few years, I will become six times your age. In a few years, I will become five times your age. In a few years, I will become four times your age." you said that Xiao Ming's grandfather is () years old A. 60B. 69C. 70D. 72
19. Xiao Ming, a primary school student, asked his grandfather how old he was this year. He replied, "I am more than seven times your age this year. In a few years, I will become six times your age. In a few years, I will become five times your age. In a few years, I will become four times your age." you said that Xiao Ming's grandfather is () years old A. 60B. 69C. 70D. 72
20. Xiao Ming asked his grandfather how old he is this year, and he replied, "I am seven times your age this year, six times yours in a few years, and I will become yours in a few years."