6*5=30 3 1

5*5=25 30

So when Xiao Qiang was 6.25 years old, his father was 6.25*5=3 1.25 years old.

(32-7)/(5- 1)=6.25 (year)

(32-7)/(6- 1)=5 (year)

Xiao Qiang is 7 years old and his father is 32 years old. When he was five years old, his father was five times as old as Xiao Qiang.