mark has 8 packs of pretzels in a paper bag. Each pack of pretzels is 90 grams. the bag is 85 grams. What is the mass of the paper bag with the pretzels in it?

Question

I need to find the mass of the paper bag

Answer 1

"I need to find the mass of the paper bag"  

 

No, you don't -- you've been told that the bag weighs 85 grams.

The weight of the 8 bags of pretzels is 8 times 90 grams each, or 720 g.

 

All told (total) there are 805 grams.