Answer:
The percent decrease of water in the tank is 30%
Step-by-step explanation:
A tank contained 10 cm of water.
After several hours, it contained 7 cm of water
So, decrease in water = 10 cm - 7 cm = 3 cm
The percent decrease of water in the tank = [tex]\frac{\text{Change in amount of water}}{\text{Initial amount}} \times 100[/tex]
The percent decrease of water in the tank = [tex]\frac{3}{10} \times 100[/tex]
= [tex]30[/tex]
Hence the percent decrease of water in the tank is 30%
