Exactly 80 liters of 20% are needed.
Let quantity of 20% alcohol solution be added : x liters
Here is the work:
> x*20% + 40 * 50% = (x+40) * 30%
> x*0.2 + 40*0.5 = (x+40)*0.3 ..(converting percentages into decimal)
> 0.2x + 20 = 0.3x + 12
> 20-12 = 0.3x - 0.2x (Rearranging similar terms)
> 8 = 0.1 x
Hence x = 8/0.1
Ans 80 Litres
the answer is B. retaking a class after not receiving a passing grade
took the test on edge and got it right
Answer:
A 2:10 kg wooden block is tied to a rope and spun in a circular path of radius 1.12m. The block obteins a maximum speed of 10m/s
Explanation:
A. Drop out of high school to pursue your dreams.
(possible but with the lack of qualifications, not many companies are not convinced to hire you).
B. Learn the retirement age of those in the profession.
( You learn from their experiences and mistakes but you still lack the hands on work experience.)
C. Learn the unemployment rate in the career field.
( To be mentally prepared if you're willing to take the risk in the career field.)
Answer:
D. Research volunteer work or internships related to the career field. (they are up to date, you gain the experience towards the current career field.) (This is the best option)
Answer:
Son
Explanation:
Just got 100%, but further explanation: Es and esta are both easy to rule out, as neither of them refers to "they" (Alan y Enrique), and estan does not work because of the weird rules. Tbh I feel like you just have to memorize them except in some cases where one just clearly makes more sense than the other.
