Salt water seed selection needs 1.1 × 103kg / m3 of salt water. Now 0.05m3 of salt water is prepared, and its mass is 60kg. Does this salt water meet the requirements? If not, should water or salt be added? How much more?

Salt water seed selection needs 1.1 × 103kg / m3 of salt water. Now 0.05m3 of salt water is prepared, and its mass is 60kg. Does this salt water meet the requirements? If not, should water or salt be added? How much more?

(1) Let the density of brine be ρ, the density of brine be: ρ = MV = 60kg0.05m3 = 1.2 × 103kg / m3, ∵ ρ ＞ ρ 0 = 1.1 × 103kg / m3, ∵ the prepared brine does not meet the requirements; (2) the density of brine is too high, so water needs to be added to reduce the density; (3) if the mass of water to be added is △ m, then m after adding water is always equal to M