Question 792367
The cabinet maker's rate of working is:
( 3 cabinets ) / ( 2 days )
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If the apprentice works at half that rate,
his rate is:
( 3 cabinets ) / ( 4 days )
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How long will it take the apprentice to make
3 times as many cabinets?
It will takes 3 times as long, or {{{ 3*4 = 12 }}} 
12 days
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In terms of just units,
( number of cabinets ) / ( rate in cabinets/days ) = days
{{{ 9 / ( 3/4) = 12 }}}