Animlolie
13.01.2020 •
Mathematics
Brine is a solution of salt and water. if a tub contains 70 pounds of a 5% solution of brine, how much water (to the nearest tenth lb.) must evaporate to change it to an 7.5% solution?
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Ответ:
0.05(70) = (0.075)(70-x)
Take note that we modeled this expression by keeping in mind that the amount of solute (salt) will always be equal, and it is the solvent (water) that will change therefore affecting the percentage of the concentration of the solution.
Solving for x:
70 - x = 0.05(70)/(0.075)
x = 23.3 lbs of water.
Ответ:
it means in math that perpendicular line is the line of bisector and the segment is 555 - 2 equal s 553.
Step-by-step explanation:
the the answer is in the top