The hindered settling velocities of a very fine sand particles and water suspension are as follows:

Terminal velocity of single sand particle

$2\mathrm{.}8$ m S

Settling velocity of sand particles and watersuspension

$30$ mm

S

Calculate the percentage of solids by volume in the suspension. $($Note: The index of Richardson$-$Zaki is $4\mathrm{.}65.$

$62\%$

$25\%$

$38\%$

$2$The hindered settling velocities of a very fine sand particles and water suspension are as follows:

Calculate the percentage of solids by volume in the suspension. $($Note: The index of Richardson$-$Zaki is $4\mathrm{.}65.$

$62\%$

$25\%$

$38\%$

$75\%$

$75\%$