If you place one staple on an electronic balance,the balance still reads 0.0 grams.however,if you place 210 staples on the balance ,it reads 6.80 grams. What is the mass of on staple?

Answer 1

210/6.8 = 1/x

210x = 6.8

x = 0.03238 grams = 32.4 milligrams