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A barrel of water is full. It decreases by 85%. Now it has 120 liters of water. How much liters of water did it have to begin with?

 Jan 25, 2020
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In order to find the original amount of water, we divide the amount given by its corresponding percentage, in this case 15% (because if 85% of water is gone then 15% remains).

 

If x represents the original amount of water, then:

 

120 = (0.15)x

 

x = 800

 

There was originally 800 liters of water

 Jan 25, 2020

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