. Math problem in the fourth grade of primary school: Grandpa is 70 years old and Xiaoming 10 years old. A few years later, grandpa was five times as old as Xiaoming. What should I do without setting

. Math problem in the fourth grade of primary school: Grandpa is 70 years old and Xiaoming 10 years old. A few years later, grandpa was five times as old as Xiaoming. What should I do without setting X? Hello:

The difference between grandpa and Xiaoming this year is 70- 10=60 (years old).

No matter how many years, grandpa and Xiaoming are 60 years apart.

Grandpa is five times older than Xiaoming, that is, grandpa is five-1= four times older than Xiaoming.

So Xiao Ming's age was 60 ÷ 4 = 15 (years old).

15- 10=5 (year)

Five years later, grandpa is five times as old as Xiaoming.

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