Y is a directly proportional to x and y= 15 when x =6. Find x when y =40.

x = 16 when y = 40

Step-by-step explanation:

as y is directly proportional to x:

y = x

y = k x k is here constant.

15 = k * 6

k = 15/6

k = 5/2

Here constant, k is (5/2)

So when y = 40

y = k x

40 = (5/2)x

x = 40(2/5)

x = 16

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

6 on both sides and twelve on the top and the bottom

step-by-step explanation: