Class 1, Grade 4 took part in the math competition. The average class score is 90, the average boys score 88 and the average girls score 93. There are 65,438+08 girls and 27 boys in this class.

According to the meaning of the question, there are x boys

Column equation:

(x+ 18)×90-88x=93× 18

Solution: x=27

So there are 27 boys.

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.