Question

A test tube floats with a small coin at its bottomthe mass of tube is equal to mass of 7 coins&external volume is 16cm-3 .it just sinks whenthe third coin is added calculate the mass of each coin

Answer 1

let mass of coin be x
and mass of tube be y
7x=y-------1
x+y=16------2
putting value of y in eq. 2
x+7x=16
8x=16
x=2
hence mass of coin is 2 unit