How much water must be added to 10 gallons of 10% brine solution to decrease the concentration to 4%? Choose the correct choice from the following answers:
A) 0—1.5 gal
B) 1.5—3 gal
C) 3—4.5 gal
D) 4.5—6 gal
E) 15+ gal
Let amount of water that must be added in gallons to dilute concentration of brine solution = x   Amount of brine already present = 10/100 * 10= 
<gadget id="calculator">10/100 * 10</gadget>
<output>1</output>
1 gallon   1/(10+x) *100= 4   =&gt;100 = 40 + 4x   =&gt; x= 60/4= 
<gadget id="calculator">60/4</gadget>
<output>15</output>
15   Answer 15+ gal
<result>E</result>
How much water must be added to 10 gallons of 10% brine solution to decrease the concentration to 4%?