The ratio of the number of andy's seashells to the number of ben's seashells is 4:9 . andy has 100 seashells. how many seashells does ben have?

Ben has 225 seashells

Step-by-step explanation:

Step 1:  Use the ratio to see how many times the amount Andy has

4 * n = 100

4n / 4 = 100 / 4

n = 25 times the amount of the ratio

Step 2:  Find out how many shells Ben has

Use the 25 times the ratio to help

9 * 25

225

 Ben has 225 seashells

Check:  See if the ratio still works

Andy = 100

Ben = 225

100 : 225

(100/25) : (225/25)

4 : 9 -> Correct, so the answer is good

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

y < -3

step-by-step explanation:

-3y - 2 > 7

-3y -2 + 2 > 7+2

-3y > 9

-3y/-3 < 9/-3   (change the inequality sign when multiplying or dividing by a negative number)

y < -3