Question

10. How much salt must be added to 60 litres
of a 20% solution of salt to increase it to a 40 ℅solution of salt
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Answer 1

Answer:

you may use ratio and proportion formulas for this....

Answer 2

Answer:

You would need to add 20 liters of salt to the 20% mixture in order to get a 40% mixture. Since the equation is true, the solution of x = 20 is correct. That's easy to see because, if you add 20 to 12 you get 32, and if you add 20 to 60 you get 80 and it's clear that 32 / 80 is equal to 4 which is equal to 40%.