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?

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• 1. 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?
• 2. 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
• 3. Grandma is 64 years old and grandson is 13 years old. How many more years will grandma be four times as old as grandson?
• 4. 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)
• 5. 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
• 6. What are the characteristics of numbers divisible by 2 and 5 at the same time
• 7. Characteristics of numbers divisible by 2,3,5,9
• 8. 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
• 9. If the sum of the numbers of an integer can be divided by 3 (or 9), then the number must be divided by () or ()
• 10. 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
• 11. 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
• 12. 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
• 13. 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
• 14. 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."
• 15. My grandfather said to Xiaoming, "I'm seven times your age now, six times your age in a few years, five times, four times, three times and two times your age in a few years." do you know my grandfather's and Xiaoming's age now? Pay attention to the specific methods! Thank you, please help me! I will increase the reward score ~ \ (≥ ▽≤) /! What I want is a concrete process, not an answer
• 16. Ye said to Xiao Ming, "I am seven times as old as you. In a few years, I will be six times as old as you. In a few years, I will be five times, four times, three times and two times as old as you respectively." do you know the age of my grandfather and Xiao Ming?
• 17. My grandfather said to Xiao Ming, "I'm seven times as old as you now, and six times as old as you in a few years My grandfather said to Xiaoming, "I am seven times as old as you are now. In a few years, I will be six times as old as you are. In a few years, I will be five, four, three and two times as old as you are." do you know the age of my grandfather and Xiaoming now
• 18. 8. My grandfather said to Xiao Ming, "I am seven times as old as you are now. In a few years, I will be six times as old as you. In a few years, I will be five times, four times, three times and two times as old as you respectively." do you know the age of my grandfather and Xiao Ming now?
• 19. My grandfather said to Xiao Ming, "I'm seven times your age now, six times your age in a few years, five times, four times, three times and two times your age in a few years."______ Xiao Ming is now______ ．
• 20. My grandfather said to Xiao Ming, "I'm seven times your age now, six times your age in a few years, five times, four times, three times and two times your age in a few years."______ Xiao Ming is now______ ．