When a number is decreased by 10% of itself, the result is 9. What is the number?

10-10%

Step-by-step explanation:

Think of it like this, 100% - 10% is 90%. But instead of 3 digits, it's just 2. So it would be the same as that just not as a hundred.

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

step-by-step explanation:

i think you should think about the question and not look online.