Ferdinand's Proportion Problems

Joey bought 3 apples for $6. How much would it be for 12 apples?
Let x be the price for 12 apples.

      

Quinny bought 2 hotdogs for $3. Later, he came back and bought 4 hotdogs, how much was the 4 hotdogs?
Let x be the price for 4 hotdogs.
           
   

The price for 4 hotdogs is $6.



Your Turn :D

Jim-Boy bought 5 pencils for 20 cents. How much would it be for 15 pencils?