Rheanna's Proportion Problems

http://pixabay.com/en/sponge-cake-cream-filling-cake-524444/

1- If 3 twinkies cost $1, how much is it for 15 twinkies? 

15 twinkies cost $5. 

2- To make lemonade, you need 6 lemons and 6 cups of water. How many lemons do you need if you have 24 cups of water? 

I need 18 lemons to make lemonade with 24 cups of water. 

Try Solving- Three posters cost $9.60. At this rate, how many posters can you buy for $48.