Question

if 1 kg of water is mixed with 2 kg of liquid of density 3 gram per centimetre cube then the average density of mixture will be

Answer 1

water=1kg=1*1000g=1000g

1 gram of water has density  =1gram/cm^3

1 gram of water has density=1000*1=1000gram/cm^3

1 gram of liquid has density =3gram/cm^3

2000 gram of liquid has density=2kg=2000g

to calculate average density we add density of water and liquid and divide it by 2

density of water+density of liquid/2

(1000+6000/2 )g/cm^3

(7000/2 )g/cm^3

average density=3500g/cm^3