Question 75

Find x , if 30% of 400 + x % of 70 = 25% of 536.

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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