After Xiaogang gave Xiaoming 10% of his total number of stamps, the number of them was equal, so Xiaoming's stamps were ()% less than Xiaogang's

After Xiaogang gave Xiaoming 10% of his total number of stamps, the number of them was equal, so Xiaoming's stamps were ()% less than Xiaogang's

After Xiaogang gives Xiaoming 10% of his total number of stamps, the number of stamps of the two people is equal, so Xiaoming's stamps are less than Xiaogang's (20)%