To solve a problem by means of the equation. To hand over in time a house examination the pupil has to solve daily 5 problems. But he solved 3 tasks a day and therefore handed over a house examination 4 days later. How many problems should the pupil solve?

1) 5x=3(x+4) 5x=3x+12 5x-3x=12 2x=12 h=6dney - on 5 tasks a day 2) 5×6=30задач Answer: the pupil should solve 30 problems. Vrodeba 6, but not precisely
Answer add