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

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

The age difference between grandfather and Xiaoming should be a multiple of 6, 5 and 4 respectively, and the minimum number is 60. Therefore, the age difference is 60. Suppose grandfather's age is x years old this year, then Xiaoming's age is X-60 years old. According to the meaning of the question, we get x > 7 (X-60), and the solution is x < 70, so we take x = 69, then X-60 = 9, which is in line with the meaning of the question, so grandfather's age this year is 69 years old, so we choose B