A+A+A+A+A=100 (B + b) / (division sign) a = 100 B+A+B+A-C=100 Then: a = () B = () C = ()

Title: a + A + A + A + a = 100
(B + b) / (division sign) a = 100
B+A+B+A-C=100
So: a = (20) B = (1000) C = (1940)

How to write

Chicken and rabbit in the same cage: there are 8 heads and 26 feet in the cage. How many chickens and rabbits each?
If there are x rabbits, there are (8-x) chickens
4x+2(8-x)=26 8-5=3
4X + 2 * 8-2x = 26, 5 rabbits and 3 chickens
2x =10
x =5

Why, in any four integers, there must be such two integers, their difference can be divided by 3

For any number a, the remainder divided by 3 has three cases: 0,1,2
According to the drawer principle, at least two of the remainder of any four numbers divided by 3 are the same. Suppose that the two numbers with the same remainder are a and B
Then (a-b) must be divisible by 3
In fact, it is a deformation of the drawer principle

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