Jessica has four more hockey cards than one third the number of cards that david owns if jessica has 12 hockey cards how many does david have

I believe the answer would be 24

work:

12-4=8   8x3=24

We can use the equation j=1/3(d)+4, where j represents Jessica's cards and d represents David's cards. We already have the number of cards that Jssica has, so we can just solve the equation.

12=1/3(d)+4
simplified is
8=1/3(d)
which is d=24

So David has 24 cards.

:)

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.