Question

how much salt must be added to 60 liters fo a 20% solution of salt to increase it to a 40% solution of salt​

Answer 1

Step-by-step explanation:

Given : 60 litres of a solution of a 20% salt to increase it to a 40% solution of salt.

To find : How much salt must be added?

Solution :

Let x liter of the salt is added.

Add x liter of 100% salt.

i.e. Total amount = x+60

According to question,

100x+60\times 20=(x+60)\times 40100x+60×20=(x+60)×40

100x+1200=40x+2400100x+1200=40x+2400

60x=120060x=1200

x=20x=20

Therefore, 20 liter of salt must be added.