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Question

If one-fourth of half of a number is 25, then 20% of that number is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
40

Finding the Number

Let the unknown number be represented by the variable \(x\).

The problem states that "one-fourth of half of a number is 25". This can be translated into the following mathematical equation:

$ \frac{1}{4} \times \left( \frac{1}{2} \times x \right) = 25 $

Simplify the expression on the left side:

$ \frac{1}{8}x = 25 $

To solve for \(x\), multiply both sides of the equation by 8:

$ x = 25 \times 8 $

$ x = 200 $

The number is 200.

Calculating 20% of the Number

The question requires finding 20% of the number calculated (which is 200).

Calculate 20% of 200 using the percentage formula:

$ \text{Percentage} = \frac{\text{Part}}{\text{Whole}} \times 100 $

Or simply calculate the value:

$ 20\% \text{ of } 200 = \frac{20}{100} \times 200 $

$ = 0.20 \times 200 $

$ = 40 $

Thus, 20% of the number is 40.

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Important Questions from Percentage

  1. Radha saves 25% of her income. If her expenditure increases by 20% and her income increases by 29%, then her savings increase by;

  2. The income of A is 45% more than the income of B and the income of C is 60% less than the sum of the incomes of A and B. The income of D is 20% more than that of C. If the difference between the incomes of B and D is Rs. 13200, then the income (in Rs.) of C is:

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  4. The population of a city increased by 30% in the first year and decreased by 15% in the next year. If the present population is 11,050 then population 2 years ago was:

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