U-tube

Initially, the U-tube shown above is filled with water, and the level on each side is 0=5 cm.\ell_0 = \SI{5}{\centi\meter}. After some oil is poured on side A,A, the level on that side becomes LA=7.3 cm.L_A = \SI{7.3}{\centi\meter}.

What is LBL_B ((in cm)?\si{\centi\meter})?

Assume that the water and oil do not mix, and that their densities are related by ρoil=0.85ρwater.\rho_\textrm{oil} = 0.85\rho_\textrm{water}.

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