Posted by **ayan** on Monday, March 18, 2013 at 12:23am.

Sally sells seashells by the seashore. In the morning, her sack of shells weighed 70 N. She sold seventy shells and in the evening her sack weighed 7 N. What was the average mass in kg of the shells she sold?

- science -
**Dave**, Monday, March 18, 2013 at 7:35am
0.0928

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