Ben, Tim and Nick went camping.  They roasted marshmallows for everyone.  Each of them put two marshmallows on a stick at a time.  They roasted marshmallows like this 7 times.  How many marshmallows did they roast altogether?

They made s’mores out of the marshmallows they roasted.  They used 2 roasted marshmallows, 2 graham crackers, and 1/2 of a chocolate bar on each s’more.  They made them until their roasted marshmallows ran out.

How many graham crackers did they use altogether?

How many chocolate bars did they have before they started making the s’mores?