Find the number : 85% of 420 + ?% of 1080 = 735

Answer: Option C

Given,
(85% of 420) + (?% of 1080) = 735
$$\Rightarrow \left(\frac{85\times 420}{100}\right)\times \left(\frac{(?)\times 1080}{40}\right)$$       $$=735$$
$$\begin{array}{rl}& \Rightarrow 357+\left(\frac{(?)\times 1080}{100}\right)=735\\ & \Rightarrow \left(\frac{(?)\times 1080}{100}\right)=\left(735-357\right)\\ & \Rightarrow \left(\frac{(?)\times 1080}{100}\right)=378\\ & \Rightarrow (?)=\frac{378\times 100}{1080}\\ & \Rightarrow (?)=35\end{array}$$