SOLUTION: A tank is 50% full of water. 4 gallons of water are added to it , filing the tank to 70% of its capacity. What is the tanks full capacity (in gallons) ?

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Question 1122225: A tank is 50% full of water. 4 gallons of water are added to it , filing the tank to 70% of its capacity. What is the tanks full capacity (in gallons) ?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
20% is 4 gallons.

Do you see what to do?
0.2%2AV=4

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
4 liters make exactly 20% of the container capacity  (20% = 70% - 50%).


Hence, the capacity of the containers is 5 times 4 liters, i.e. 20 liters.