Physics Question: Mass of fisherman in boat?

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fisherman of mass = mf pushes flat-bottom boat (area ab = 2.00 m2 , mass mb = 280.0 kg ) water , steps in. uses meter stick , measures, relative bottom of boat, water level = 0.20 m. density of water pw = 1000.0 kg/m3.
q) fisherman's mass (kg) = mf ?
a) 40
b) 80
c)120
d) 135
e) 180
?
thank you!

a fisherman of mass = mf pushes flat-bottom boat (area ab = 2.00 m2 , mass mb = 280.0 kg ) water , steps in. uses meter stick , measures, relative bottom of boat, water level = 0.20 m. density of water pw = 1000.0 kg/m3. q) fisherman's mass (kg) = mf ? a) 40 b)...


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