If a donut shop sells a dozen donuts for $6.00, what would the cost of 9 donuts be?

Question

hero · Answer

A dozen donuts is 12 donuts so

hero · Answer

$$\frac{12 \text{donuts}}{9 \text{donuts}} = \frac{$6}{$x}$$

$$\frac{12}{9} = \frac{6}{x}$$

hero · Answer

Simplify and solve for x:

$$\frac{4}{3} = \frac{6}{x}$$

Cross multiply:
4x = 18
  x = 18/4
  x = 9/2
  x = 4.5

hero · Answer

In terms of dollars, the cost of 9 donuts is $4.50

unklerhaukus · Answer

@Hero, please try to leave some of the work to the OP.

hero · Answer

1. The OP wasn't around
2. Someone posted an incorrect solution, so I wrote the correct solution. Then the other person deleted their solution and disappeared. Sorry to disappoint you.