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?
~~~~~~~~~~~~~~



<pre>
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.


<U>ANSWER</U>.   Add 1 liter of water every day.
</pre>

Solved.