Question: How do I go about properly solving this? Isotopic Fasteners What is the percent Isotopic Abundance abundance of the 2.5cm long A carpenter opened a

How do I go about properly solving this?

Isotopic Fasteners What is the percent Isotopic Abundance abundance of the 2.5cm long A carpenter opened a drawer to find nails? all of his fastening nails mixed up. He A. 70.5% decided to use it as an example of B. 18.9% determining a weighted average of the C. 67.0% length of the nails for his apprentice. The drawer contained 95 nails. There were 18 nails of 5.0cm length, 10 nails of 7.5cm length, and 67 nails of 2.5cm length. Determine the percent abundance for each length of nail

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