
Sanjay S. answered 01/22/15
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Ladois,
Let h be the hrs John works as security guard
He will work 60-h hrs as landscaper
Also,
9.5*h + 12*(60-h) = 657.5
-2.5h = 657.5-720
h = 25
So 25 hrs as security guard and 35 hrs as landscaper