1. A rectangular section of road with a length of 800 m and a width of 50 m was paved with asphalt. For every 100 m$^{2}$ of road, 3 tons 800 kg of asphalt were used. How many tons of asphalt were used?
1. 2) $800 \times 50=40000 \mathrm{~m}^{2}$ - the area of the road;
2) $40000: 100=400$ times - the road contains $100 \mathrm{m}^{2}$ segments;
3) $3800 \times 400=1520000 \mathrm{~kg}=1520 \mathrm{~T}$ - the amount of asphalt used.

Answer: 1520 tons of asphalt were used.