The graph between two temperature scales A and B is shown in figure. Between upper fixed point and lower point there are 150 equal division on scale A and 100 on scale B. The relationship for conversion between the two scales is given by $\frac{t_A-x}{y}=\frac{t_B}{z}$. Where $t_A$ and $t_b$ temperature on scale A and B respectively. find  $\frac{yz}{x}$