This should show you the answer!
About 6.5 I believe, I looked it up and a gross was a total of 144 of something, also known as a dozen dozen.
Setup Equation Based Off Merits
Sin V = opp/hyp
Sin 60 = opp/18
opp = sin 60 x 18
opp = 15.6
opp = 9 root 3
Answer:
D
Jupiter has greatest mass.