Posted by seb on .
A recipe for cookies calls for 4 eggs. The recipe makes 6 dozen cookies. how many eggs would be need to make 21 dozen cookies?

Solve the proportion 
Ms. Sue,
4 / 6 : x / 21
Cross multiply.
We'll be glad to check your answer. 
Solve the proportion 
seb,
63 eggs?

Solve the proportion 
Writeacher,
No, from the proportion, you should see that x will be less than 21, not more.
4/6 : x/21 crossmultiplied ~~> 4*21=6x
Now solve for x. Multiply 4*21 and then divide both sides by 6. What's the answer? 
Solve the proportion 
seb,
14 eggs!

Solve the proportion 
Ms. Sue,
Right! :)