hello man are you good come get your pizza
Since Density = mass/ volume (d = m / v), and assuming the 15 fish weigh 1 gram each - if weight of each fish isn't given - (making that a total of 15 grams),
D = m / v
0.3 = 15 / v
v = 15 / 0.3 = 50 ft cubed
Hope this answers your question correctly :)
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Solve this as you would an equation. Subtract 5x from both sides and subtract 7 from both sides and what you get is
. Solve that for x and get that
which of course means that
which is D in your choices.