Question

A chemist has one solution which is 50% acid and a second which is 25% acid. How much of

each should be mixed to make 10 litres of 40% acid solution. ​

Answer 1

Answer:

Let x litres and y litres be the amount of acids from 50% and 25% acid solutions respectively. 

As per the question

  50% of x + 25% of y = 40% of 10

⇒ 0.50x + 0.25y = 4  ⇒ 2x + y = 16 ………(i) 

Since, the total volume is 10 liters, so  x + y = 10 

Subtracting (ii) from (i), we get  x = 6 

Now, putting x = 6 in (ii),

we have  6 + y = 10

⇒ y = 4 

Hence, volume of 50% acid solution = 6litres and volume of 25% acid solution = 4litres.

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Answer 2

plz refer to this attachment