Question 883924
Tubs for 60 people will need
{{{ 8*60 = 480 }}} gallons of water
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Showers for 60 people will need
{{{ 6*60 = 360 }}} gallons of water
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{{{ 480 - 360 = 120 }}}
If tubs are used instead of showers,
120 more gallons of water 
will be needed