Mathematics topic, Zhang Qiang's uncle came to see him. Zhang Qiang asked how old his uncle was. My uncle said that when I was your age, you were only 4 years old. I was 40 years old when you were my age. Solution: Make Uncle X older than Zhang Da.

According to the meaning of the question: 4+x = 40-x-x.

Solution: x= 12

∴4+x=4+ 12= 16 (years old)

∴40-x=40- 12=28 (year)

A: My uncle is 28 years old and Zhang Qiang 16 years old.