Asap.
find the percent decrease from 20 to 17. round to nearest tenth if necessary.
also can someone explain how to do it

  15% decrease

Step-by-step explanation:

The appropriate formula is ...

  (percentage change) = (amount of change)/(original value) × 100%

Where the amount of change is ...

  (amount of change) = (new value) - (original value)

___

Putting these two formulas together, we get ...

  (percentage change) = ((new value) - (original value))/(original value) × 100%

__

Another way to write the same formula is ...

  (percentage change) = ((new value)/(original value) - 1) × 100%

Filling in the numbers you have, you get ...

  (percentage change) = (17 - 20)/20 × 100%

     = -3/20 × 100%

     = -15%

When the percentage change is negative, it means the change was a decrease.

Here, you know the change is a decrease and you just want to know the amount of decrease. That amount is a 15% decrease.

18.75 gallons

step-by-step explanation: