Question 1161827
.
<pre>

(a)  The amount (the mass) of salt is  0.07*65 kilograms = 4.55 kilograms.


     To dilute it to 5% salt by mass, the amount (the mass) of water "m" should be added to get


        {{{(0.07*65)/(65+m)}}} = 0.05.


    Solve this equation for "m".


        {{{(0.07*65)/0.05}}} = 65 + m

        7*13 = 65 + m

        91   = 65 + m

        m    = 91-65 = 26 kilograms of pure water, or 26 liters.


    <U>ANSWER</U>.  26 liters (kilograms) of water should be added.
</pre>


Part (a) is just solved.



<pre>
(b)  The mass "m" of water should be evaporated to satisfy this concentration eauation


        {{{(0.07*65)/(65-m)}}} = 0.09.


    Solve it for "m"


        {{{(0.07*65)/0.09}}} = 65 - m

        50.555      = 65 - m

        m           = 65 - 50.555 = 14.444  kilograms of water must be evaporated.


    <U>ANSWER</U>.  14.444 kilograms / (liters) of water must be evaporated.
</pre>

Solved.


-------------------


See the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/mixtures/Special-type-mixture-problems-on-DILUTION-adding-water.lesson>Special type mixture problems on DILUTION adding water</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/mixtures/How-much-water-should-be-evaporated.lesson>How much water must be evaporated</A> 

in this site.


A convenient place to quickly observe these lessons from a &nbsp;"bird flight height" &nbsp;(a top view) &nbsp;is the last lesson in the list.


Read them and become an expert in solution the mixture word problems.


Also, you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lessons are the part of this online textbook under the topic "<U>Mixture problems</U>".



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.