SOLUTION: Gino has already filled 12 liters of water in the tank and will add a fixed amount (in liters) of water each day. How much water should Gino put per day if he will spend 8 days fil

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Gino has already filled 12 liters of water in the tank and will add a fixed amount (in liters) of water each day. How much water should Gino put per day if he will spend 8 days fil      Log On


   

Question 1163526: Gino has already filled 12 liters of water in the tank and will add a fixed amount (in liters) of water each day. How much water should Gino put per day if he will spend 8 days filling the tank to get 20 liters total?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Description can be for linear equation in form y=mx+b.

20=%28m%29%288%29%2B12
-
8m=20-12
8m=8
m=1
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highlight_green%28y=x%2B12%29---------------------------one liter each day

Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
.
Gino has already filled 12 liters of water in the tank and will add a fixed amount (in liters) of water each day.
How much water should Gino put per day if he will spend 8 days filling the tank to get 20 liters total?
~~~~~~~~~~~~~~ 


Let d be the amount of water to add every day.

Then after 8 days


    20 = 12 + 8*d

    20 - 12 = 8d

       8    = 8d

       d    = 8/8 = 1.


ANSWER.   Add 1 liter of water every day.

Solved.