A plastic bottle with a volume of 2.5L can hold water. How many kilograms can it hold at most? How about filling it with gasoline? (1L = 1dm3 = 1 × 10-3m3, ρ gasoline = 0.71 × 103kg / m3)

(1) Volume of water filled in bottle: vwater = vroom = 2.5L = 2.5 × 10-3m3, according to ρ = MV, the maximum mass of water in plastic bottle: mwater = ρ water, vwater = 1.0 × 103kg / m3 × 2.5 × 10-3m3 = 2.5kg; (2) volume of gasoline filled in bottle: voil = Vroom = 2.5L = 2.5 × 10-3m3, the maximum mass of gasoline in plastic bottle: meol = ρ oil, voil = 0.71 × 103kg / m3 × 2.5 × 10-3m3 = 1.775kg; answer: use the bottle It can hold 2.5kg water at most and 1.775kg gasoline at most

Why is it forbidden to throw transparent water bottles in the forest
Be concise and specific

Water bottles are like convex lenses, which can focus sunlight and cause forest fires. In order to prevent fires, it is forbidden to throw drink bottles in the forest!

Xiao Fang bought five boxes of sugar and Xiao Ming four boxes of biscuits for a total of 44 yuan. If two people exchange one box for another, the value of their goods is equal. How much is each box of sugar and biscuits

Two people exchange a box and the value is equal
4 sugar + 1 cake = 3 cakes + 1 sugar = = 44 / 2 = 22 yuan (total price is 44 yuan)
That is, 3 sugar = 2 cakes, 1 cake = 1.5 sugar
5 sugar + 1 sugar = 22 yuan
So a box of sugar 22 / 5.5 = 4 yuan
A box of biscuits 1.5 * 4 = 6 yuan

A plastic bottle with a volume of 2.5L can hold water. How many kilograms can it hold at most? How about filling it with gasoline? (1L = 1dm3 = 1 × 10-3m3, ρ gasoline = 0.71 × 103kg / m3)