Question

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Answer 1

masa vasului plin cu apa = masa vas + masa apa 

masa vasului cu petrol = masa  vas + masa petrol 
m vas  cu apa - m vas cu petrol = m apa  + m vas - m vas - m petrol ==  m apa - m petrol = 125 g 
m apa = ρ apa x  volum m petrol = ρ petrol x volum m apa - m petrol = Volum ( ρ apa - ρ petrol ) 
V = ( m apa - m petrol ) / ( ρ apa - ρ petrol = 125 g / 0,2 g/cm³) = 625 cm³
 volum vas = 625 cm³