in air an object weighs 15N. when immersed in water it weighs 12 N. when immersed in another liquid it weighs 13 N.determine the density of the object and that of the other liquid

Answer 1

density*volume is mass
so
density*V=15
12=15-densitywater*V
13=15-desnityLiquid*V
You know densitywater. You are left with two equations, two unknowns. I assume you can handle that
V=15/densityobject
use 12=15-densitywater*15/densityobject now to solve for density
then the final equation to find densityliquid

Answer 2

I want an answer