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efb
What is it?
10000D = A × (47/2)A × (51/2)A
= A³ × (47 × 51)/(2 × 2)
so
A³ = (10000/((47 × 51)/(2 × 2))) × D
so
A = ∛(16.6875260743 × D)
Once you know the value of D, you can evaluate A, then B and C are simple fractions of that.