posted by kay .
The exterior dimensions of a saef are 90 cm x 50 cm x 30 cm. if the walls of the safe are 1.5 cm thick, what is the interior volume of that safe?
Subtract 1.5 cm from 90 cm and from 50 cm and from 30 cm.
Then multiply to find the volume:
(90 - 1.5)(50 - 1.5)(30 - 1.5) = ?? cm
If I'm wrong, another teacher will correct me.