Laboratory

In the laboratory, twelve liters of 80% prepared 40% alcohol were diluted to a final 70% alcohol. A five-liter barrel of 40% alcohol was available. How much will remain in the barrel of 40% alcohol?

Correct answer:

x =  1 l

Step-by-step explanation:

V1=12 l r1=80%=10080=54=0.8 r2=40%=10040=52=0.4 r3=70%=10070=107=0.7  V2=5 l  r1 V1+r2 w=r3 (V1+w) 0.8 12+0.4 w=0.7 (12+w)  0.3w=1.2  w=0.31.2=4  w=4  x=V2w=54=1 l



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You need to know the following knowledge to solve this word math problem:

algebrabasic functionsUnits of physical quantitiesthemes, topicsGrade of the word problem

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