given ,
in an hour...
julian--- either 1 L or 1 C
jafahre-- either 1 L or 2 C
Lou---either 2 L or 1 C
then total service produced in mowing lawns for 10 hours is (1+1+2)*10=40 lawns mowed
then total number of car washed =( 1+2+1)*10=40 cars
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