Question

How many liters of water should be added to 18 liters of a 14% bleach solution so that the resulting solution contains only 10% bleach?

Answer 1

Answer:

0.72 liters

Step-by-step explanation:

First, to solve this problem, since the 18 liters contain just 14% bleach, we will find the amount of bleach solution;

14% of 18 liters  = $\frac{14}{100}$    ×   18   =  $\frac{252}{100}$  = 2.52 liters

This means we only have  2.52 liters of bleach

To get the numbers of liters that must be added to 2.52 liters so that it becomes 10% bleach, we need to find 10% of the solution

10% of 18 liters = $\frac{10}{100}$  × 18 = $\frac{180}{100}$   = 1.8 liters

SO, we will just subtract the 10% from the 14% solution

That is;

2.52 liters -  1.8 liters  = 0.72 liters

Therefore 0.72 liters of water must be added to 18 liters of a  14% bleach solution so that the resulting solution is 10% bleach.

Answer 2

Answer:

18 liter = 14% Bleach

............ = 10% Bleach

......=

$\frac{18 \times 10}{14}$

$\frac{180}{14}$

$= 12.9\%$