Question 899693
Let {{{ n }}} = the number of days that pass
The {{{ 3 }}} friends each made {{{ 4 }}} bags of tea
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For {{{ 1 }}} of the {{{ 3 }}} friends:
{{{ 192 / 3 = 4^( n/10 ) }}}
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{{{ 64 = 4^( n/10 ) }}}
{{{ 64 = 4^3 }}}
{{{ n/10 = 3 }}}
{{{ n = 30 }}}
The other 2 friends are making tea bags at the same rate, 
so I would say:
30 days pass before 192 bags are made