Agreed, just a liiiiiittle too sus but hey, we all have our own levels XD
No honey! Have you asked yourself, do you like jesus or you just want to go to Heaven ?
Answer:
x = 6 (A)
Explanation:
We plug y = x^2 - 5x + 3 into 5x + y = 39 and we have
5x + x^2 - 5x + 3 = 39
-> x^2 = 36
-> x = 6
Less time spent making a decision.
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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
