Knowing how to solve is only half the work: the other half is understanding which equation to write starting from a problem stated in words. This section presents the general translation method — read, choose the unknown, translate into an equation, solve and check — and puts it to the test on a gallery of classic problems (ages, motion, mixtures, tanks, percentages, sharing), all reducible to a single linear equation.
The worked exercises linked to this section are in the folder Exercises.