If 20% of a = b, then b% of 20 is the same as:

In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is $$\frac{2}{3}$$ of the number of students of 8 years of age which is 48. What is the total number of students in the school?

Two numbers A and B are such that the sum of 5% of A and 4% of B is two-third of the sum of 6% of A and 8% of B. Find the ratio of A : B.

A student multiplied a number by $$\frac{3}{5}$$ instead of $$\frac{5}{3}$$. What is the percentage error in the calculation?

In an election between two candidates, one got 55% of the total valid votes, 20% of the votes were invalid. If the total number of votes was 7500, the number of valid votes that the other candidate got, was:

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