Question

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

Answer 1

ANSWER
>>>>>>>>>>>>>>>>>>>>

ORIGINAL AMOUNT OF SALT IN SOLUTION = 20% of 60 litres
= 12 litres

AMOUNT REQUIRED =
40% OF SOLUTION
=> 24 litres


SO AMOUNT TO BE ADDED = 12 LITRES

OR DOUBLE THE ORIGINAL AMOUNT

Answer 2

Answer:

20 liter of salt must be added.

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,

$100x+60\times 20=(x+60)\times 40$

$100x+1200=40x+2400$

$60x=1200$  

$x=20$  

Therefore, 20 liter of salt must be added.