Solution
30% of 400 + $$x$$ % of 70 = 25% of 536
$$\Rightarrow$$ $$\frac{30}{100}\times400+\frac{x}{100}\times70=\frac{25}{100}\times536$$
$$\Rightarrow$$ $$120+\frac{7x}{10}=134$$
$$\Rightarrow$$ $$\frac{7x}{10}=14$$
$$\Rightarrow$$ $$x=20$$
Hence, the correct answer is Option D
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