A machine stamps 360 metal parts in 1/4 hour. Find the unit rate in parts per hour.
1 answer:
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-2 , -3 , -4
Answer:
The answer is 4 liters.
Step-by-step explanation:
We want a final 25% solution, which means that the solvent should constitute 25 percent of all the liters of solution.
Let us call the litres of 40% solution, so when they are added to the 12 litres of 20% solution, the total litres of the new solution are:
of these liters, 25% must be the solvent:
Now for the 40% solution, the liters of the solvent are , and for the 20% liter solution, the liters of solve are
liters. Thus the total liters
of the solvent are
Therefore