Question

How many quarts of 90% solution of concentrated acid needs to be mixed with 75% concentrated acid to get 30 quarts solution of 78% concentrated acid?

Answer 1

Answer:

Step-by-step explanation:

"The concentration of solution is given with respect to 100.  

Now, we take x litre of the 90% solution as well as (30-x) of 75%.  

The explanation is given below.  

30*78 = x*90 + (30-x)*75

2340 = 90x -75x+2250  

90 = 15x

90/15=x

6 = x.

Finally, we find the value of x is 6, so 6 litres of solutions.

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