Xiao Ming and Xiao Gang are both stamp collectors. The number of stamps collected by Xiao Ming is three times that of Xiao Gang. If Xiao Gang gives 100 stamps to Xiao Ming, the number of stamps collected by Xiao Ming will be four times that of Xiao Gang?

Xiao Ming and Xiao Gang are both stamp collectors. The number of stamps collected by Xiao Ming is three times that of Xiao Gang. If Xiao Gang gives 100 stamps to Xiao Ming, the number of stamps collected by Xiao Ming will be four times that of Xiao Gang?

Let Xiaogang be x, Xiaoming be 3x
3X＋100＝4（X-100）
Sort it out: x = 500, that is, Xiaogang 500, Xiaoming 1500

Xiao Gang is a philatelic enthusiast. Once he bought two kinds of stamps with a face value of 50 Fen and 80 Fen from the post office. The total cost was 6.3 yuan. How many stamps will each have?
There are at least two possibilities

1. Because 0.5 and 0.8 are not multiples, the number of digits of multiples of 5 must be 0 or 5, and the number of digits of multiples of 8 can be 8, 6, 4, 2 or 0. The end of 6.3 is 3, which is not related to the number of digits of multiples of 5 and 8, Therefore, if the face value is 0.5 yuan, it should be 1.5 or 2.5 or 3.5 or 4.5 yuan
There are only 6.3-1.5 = 4.8, and the number is a multiple of 0.8, that is, 6 × 0.8 = 4.8, so there are 3 pieces of 0.5 denomination and 6 pieces of 0.8 denomination

Xiao Gang and Xiao Yi are stamp collectors. The ratio of stamps between Xiao Gang and Xiao Yi is 3:5. If Xiao Yi gives Xiao Gang 8 stamps, they will have the same number of stamps
How many?

If Xiao Yi gives Xiaogang eight stamps, they will have the same number of stamps
It shows that Xiao Yi is 8 × 2 = 16 more than Xiao Gang
Xiao Gang is 3, Xiao Yi is 5, the difference is 2, is 16
Xiao Yiyou: 16 ÷ (5-3) / 5 = 40
Xiaogangyou: 16 ÷ (5-3) / 3 = 24

Xiaoya and Xiaotong are both stamp collectors. Xiaoya collects 1 / 4 more stamps than Xiaotong. What percentage of Xiaoya's stamps are Xiaotong's? Xiaoya's stamps account for the total
process

If Xiaotong has 20 stamps, Xiaoya will have 25, so Xiaotong's stamps are 20 / 25 of Xiaoya's = 80%, and Xiaoya's stamps account for 25 / 45 of the total = 55.6%