Solve a problem: The earth from a ditch was taken out by 5 seven-ton and five-ton dump trucks. Kogda each car made 15 flights, it was necessary to take out 375 tons of the earth. How many did lands need to be taken out from a ditch?

330
((5x7)(5x5)) x 15 = 13125 13125 + 375 =13500 Answer: 13500 tonnotvt: 5*7+4*5 = 55 t - general heaviness of dump trucks 55*15 = 825 t - 15 flights 825+375 = 1200 t - the answer
236
Answer add