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Annette needs 20 gallons of water with a 3.5% salt concentration for her fish tank. She has a 2% salt solution and a 10% salt solution. How many gallons of each solution does she need for her tank?

 Feb 10, 2020
 #1
avatar+24430 
+2

x = 3.5% solution amount

20-x = 2% amount

 

salt content of ingredients     = salt content of final solution

3.5% (x)   + 2% (20-x)   =  10% (20)

.035 x      + .02 (20-x)    = .1 (20)                       solve for "x"  the amount of 3.5%       then  the amount of 2%  =  20-x   gallons

 Feb 10, 2020
 #2
avatar+12269 
+2

Annette needs 20 gallons of water with a 3.5% salt concentration for her fish tank. She has a 2% salt solution and a 10% salt solution. How many gallons of each solution does she need for her tank?

 

laugh

 Feb 10, 2020

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