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The density of oxygen in an oxygen cylinder of a hospital is 6kg / M and 179; when 1 / 3 mass of oxygen in the cylinder is used, the density of gas in the cylinder is 0 A. 6 kg / M; b.4 kg / M; C.2 kg / M; D. can't be sure, please tell me how to solve the problem
The oxygen volume V remains unchanged and the mass M1 is 2 / 3M
Density p = m / v = M1 / v = 2 / 3 (M / V) = 6kg / m # 179; * 2 / 3 = 4kg / m # 179;
A pile of sand has 600 tons. A truck transports 5 tons at a time. How many times do eight such trucks transport at the same time
Forty meals at a time, 15 times altogether
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