QUESTION$\mathrm{.}3$: Please take n$=1$

The result of sieve analysis of an aggregate sample is given below.

$\backslash$table$[[\backslash$table$[[$Standard Sieve Size$],[($mm$)]],\backslash$table$[[$Amount retained on$],[$each sieve $($gr$)]]],[63,0],[31\mathrm{.}5,(2785-20n)$