What should come in place of the question mark (?) in the following questions?
Expression : 27% of 450 - ? % of 375 = 76.5
=> $$(\frac{27}{100} \times 450) - (\frac{x}{100} \times 375) = 76.5$$
=> $$121.5 - 3.75x = 76.5$$
=> $$3.75x = 121.5 - 76.5 = 45$$
=> $$x = \frac{45}{3.75} = 12$$
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