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Mathematics age problem in the second volume of the first grade
Xiaole asked grandpa Zhang's age, and grandpa Zhang said, if you remove the ten digits of my age and add 18, I will be a 20-year-old boy. If you remove the single digits of my age, plus I am still a 20-year-old boy, how old is Grandpa Zhang this year?

The unit is 20- 18=2,

The decimal number is 20- 18=2,

Grandpa Zhang is 22 years old this year.