Question

How many liters of pure water must be added to how many liters of a 25% bleach solution to make 12 liters of a 15% bleach solution?

has to be in complete sentences

Answer 1

Answer: 4.8 liters

Explanation:

Let x liter of water is added with y liter of 25% beach solution.

Thus, According to the question,

x + y = 12 -------(1)

0% of x + 25 % of y = 15 % of 12

25 % of y = 15% of 12

`25 y = 15* 12`

`y = (180)/(25)`

`y = (36)/(5)`

Put this value in equation (1),

We get,

`x + (36)/(5) = 12`

`x = 12-(36)/(5)`

`x =(60-36)/(5)`

`x =(24)/(5)`

Therefore, the quantity of water =
`x =(24)/(5)=4.8\text{ liter}`

And, the quantity of 25% bleach solution =
`y =(36)/(5)=7.2\text{ liter}`