Question

An empty density bottle has a mass of x grams.Its mass is 50 grams when full of water and 65 grams when full of another liquid of density 1500 kilograms per meters cubed.Calculate the mass of the empty density bottle?

Answer 1

$$RD=\frac{1500}{1000}=\frac{65-m}{50-m}$$

$$m=20\ g$$