78% of 750 + 34% of x = 30% of 2630. Find x.

Answer: Option B

$$\begin{array}{rl}& 78\%\text{of}750+34\%\text{of}x=30\%\text{of}2630\\ & or,\frac{78\times 750}{100}+\frac{34x}{100}=\left(30\times 2630\right)\times 100\\ & or,78\times 750+34x=30\times 2630\\ & or,34x=78900-58500\\ & or,x=\frac{20400}{34}\\ & \text{Hence},x=600\end{array}$$