Twynna

This page lists questions and answers that were posted by visitors named Twynna.

Questions

The following questions were asked by visitors named Twynna.

Before 1982 the US Mint cast penny coins from a copper and zinc mixture. If a 1980 penny weighs 3.051g and contains 0.153g zinc, what is the percent of copper in the coins?
14 years ago

Answers

The following answers were posted by visitors named Twynna.