According to the meaning of the question, a chicken has an average of X eggs a day.

Because five chickens have five eggs in five days.

Column equation:

5x*5=5

x=0.2

According to the meaning of the question, 100 requires 100 eggs and y chickens.

Column equation

100*0.2y= 100

y=5

So you need five chickens.

The significance of solving equations:

Solving equations avoids the difficulty of reverse thinking, and can directly list the equations with the quantity to be solved. There are many forms of equations, such as one-dimensional linear equation, two-dimensional linear equation, one-dimensional quadratic equation and so on. , can also be combined into equations to solve multiple unknowns.

In mathematics, an equation is a statement containing one or more variables. Solving an equation involves determining which variables have values that make the equation valid. Variables are also called unknowns, and the value of the unknowns satisfying the equation is called the solution of the equation.