Wires W_1 and W_2 are made of same material having the breaking stress of 1.25 × 10^9 N / m^2. W_1 and W_2 have cross-sectional area of 8 × 10^-7 m^2…

Wires $\displaystyle W_1$ and $\displaystyle W_2$ are made of same material having the breaking stress of $\displaystyle 1.25 \times 10^9 \mathrm{~N} / \mathrm{m}^2 . \mathrm{W}_1$ and $\displaystyle \mathrm{W}_2$ have cross-sectional area of $\displaystyle 8 \times 10^{-7} \mathrm{~m}^2$ and $\displaystyle 4 \times 10^{-7} \mathrm{~m}^2$, respectively. Masses of $\displaystyle 20$ kg and $\displaystyle 10$ kg hang from them as shown in the figure. The maximum mass that can be placed in the pan without breaking the wires is \_\_\_\_ kg . (Use $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )