Q.5 (20 points) (CLO:2.4) (Estimated time: 15 minutes) A Chinese textile and fabric weaving factory has ten identical looms working during the 8-hour shift. Each loom contributes equally to the noise exposure of one worker. The combined noise level when all looms are on is 95 dB. When all looms are switched off, the noise level is 75 dB. How many of the ten looms should be turned off to achieve a full shift noise exposure level that would meet OSHA standards (AL of 85 dB) if the worker wears no personal protective equipment (PPE)?