Slimesewer

3B + 2C = 20

      B + C = 9

          B = 9 - C

3(9 - C) + 2C = 20

 27 - 3C + 2C = 20

       C = 7

       B = 2

    2 blueberry cake donuts

    7 chocolate glazed donuts

Clinton, Murphy and Samson contributed $60,000, $85,000 and $105,000
22500 (100% - 25%) (100% - 40%)

= 225000 (75%) (60%)

= 168750 (60%)

= $101250 amount shared by the 3

Let x = # of book marks Justin and Mike each have at first

        x - 20 = 2 (x - 33)

        x - 20 = 2x - 66

            46 = x

Let Ben's money = 2x

and John's money = y

Therefore x:y = 9:4

i.e x/y = 9/4 Cross multiply 

   4x = 9y -- (1)

After Ben spends $63

Ben's money becomes x - 63

      x - 63 : y = 1:2

       (x - 63)/y = 1/2

      2(x - 63) = y

      2x - 126 = y 

Input value of y in eq (1)

   4x = 9(2x - 126)

   4x = 18x - 1134

   1134 = 18x - 4x

   1134 = 14x

   1134/14 = x  x = 89

   Since 4x = 9y

     4 (81) = 9y

      324 = 9y

      324/9 = y

       36 = y

  Ben's money = $81 and

  John's money = $36

After Ben spends $63 his money

becomes $81 - $63 = $18 

John becomes $(36 - 18) more = $18 more

Let x = Clay's money

Let y = Timmy's money

            x + y = 318 (1)

            y = x - 18 (2)

Substitute (2) to (1):

        x + x - 18 = 318

           2x/2 = 336/2

           x = 168

From (2): y = x - 18

                y = 168 - 18

                y = 156

Let z = amount of money Timmy spent at the store

(150 - z) = 168

900 - 6z = 168

732/6 = 6z/6

z = $122

Tommy had 192 stickers

Terrance had 116 stickers

Assume that they have given 'x' number of stickers

Now, no. of stickers tommy had = 192 - x

         no. of stickers terrance had = 116 - x

        Given that Tommy, now have 5 times as many stickers as Terrance

            192 x - = 5 (116 - x)

            192 - x = 580 - 5x

            5x - x = 580 - 192

              4x = 388

                x = 97

Tommy and Terrance had 97 stickers.

Adam : Justin = 5:3

                          5x 3x

             5x - 7 = 3x + 7

                  2x = 14

                    x = 7

Total CD's      =   5x + 3x = 8x

                      = 8 * 7 = 56

Given, apple : orange

           = 3:2

    Let total be '3x' * '2x'.

         apple = 3x

         orange = 2x.

    Now it 40 more apples

              than orange,

             3x - 2x = 40

                      x = 40

            Apple = 3x = 120

         Orange = 2x = 80

    Now it 'y' oranges were

          removed from basket.

           (80 - y) * 2 = 120

            => 160 - 2y = 120

                 => 2y = 40

                    => y = 20

                Left orange = 80 - 20

                                = 60 oranges

Let's say they delivered x newspapers in total,

     so Ben delivered 5/8x newspapers

          Katie delivered 3/8x newspapers

      we know Katie delivered 8 fewer than Ben

               so 5/8x - 3/8x = 8

                              2/8x = 8

                              1/4x = 8

                                  x = 32
                            so 5/8 * 32 = 20

                            so Ben delivered 20 newspapers

let 6x be cookies,

  doughnuts = x

  muffins = 3x

 6x = 42

  x + 42/6 = 7 

  x = 7

  3x = 3 * 7 = 21

  6x = 42

Total dessert

= 7 + 21 + 42

= 70