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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
The sum of n odd numbers n², where n is a natural number and represents the number of terms.
<h3>What is a natural number?</h3>
The numbers that we use when we are counting or ordering, which occurs commonly and obviously in nature.
Here, given all the odd numbers from 1,3,5,7..........999.
The sum of n odd numbers, n².
999² = 998001
Thus, the sum of all the odd numbers from 1 to 999 is 998001.
Learn more about natural number here,
brainly.com/question/17429689
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Wounds, such as bites from domestic animals, wild animals and stings from marine life, such as stingrays, require professional medical attention as soon as possible to avert a potentially fatal infection of the central nervous system therefore the infection is called anaphylaxis and is denoted as option D.
<h3>What is A
naphylaxis?</h3>
This is referred to as a severe, potentially life-threatening allergic reaction and is caused by the exposure of the body to allergens.
These allergens may arise from various types of incidents such as bites from domestic animals, wild animals and stings from marine life etc and needs to be treated immediately in other to prevent complications.
Read more about Anaphylaxis here brainly.com/question/13137912
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The answer is Inirtia is the tendency of an object to resist
