SOLUTION: there are 25 students in class. the number of girls is 2 less than twice the number of boys. how many boys are in the class?

It is very simple problem.

Let x be (unknown) number of boys.

Then the number of girls is (2x-2), according to the condition, right?

When we sum them up, you will get an equation

x + (2x - 2) = 25.

Simplify and solve it:

3x = 25 + 2 = 27.

Hence, x =  = 9. It is the number of boys in the class.

Congratulations! You just solved the problem.