p = mike made pizza
q = dennis made a chef salad
r = gil burned the lemon squares.
but and and are synonymous.
check out the following reference:
http://www.jimloy.com/logic/english.htm
my guess is that this would be:
(p and q) and r
that is the same as:
p and (q and r)
it is also the same as:
p and q and r
all 3 conditions have to be true.
mike made the pizza and dennis made a chef salad and gil burned the lemon squares.
your truth table would look like this:
p q r (p^q) (p^q)^r
T T T T T
T T F T F
T F T F F
T F F F F
F T T F F
F T F F F
F F T F F
F F F F F
(p^q)^r is only true when all of p,q,r are each true.