Question 1184712
RULE:   1 yard = 3 feet
RULE:   1 foot = 12 inches


Volume of the needed topsoil
{{{31*30*(3/12)*ft^3}}}


{{{232.5}}}{{{cubic}}}{{{feet}}}



Volume of topsoil as cubic yards
{{{232.5*feet*feet*feet*(1/3)(1/3)(1/3)(yard/feet)^3}}}


{{{232.5/27}}}{{{cubic_yards}}}


{{{8.61}}}{{{cubic_yards}}}


and you can finish and decide ....  may need to round UP.