Answer: d) 0.286
Given Data :
- The VolumeVolume of air, Va = 1/7th of the total volume V
- The Volume of water, Vw= 1/8th of the total volume V
The volume of voids is the addition of a volume of air & a volume of water.
i.e. volume of voids, Vv= Va + Vw
Vv= 1/7 V+ 1/8 V
Vv= 15/56 V