16% of a number when added to 21 gives the number itself. Find the number.

2013

16% of a number when added to 21 gives the number itself. Find the number.

  1. A.

    81

  2. B.

    25

  3. C.

    18

  4. D.

    64

Attempted by 110 students.

Show answer & explanation

Correct answer: B

Let the number be x.

16% of x is 0.16x.

According to the problem, 0.16x + 21 = x.

Rearranging the equation: 21 = x - 0.16x = 0.84x.

Solving for x: x = 21 / 0.84 = 25.

हिन्दी उत्तर:

माना संख्या x है।

x का 16% = 0.16x

समस्या के अनुसार, 0.16x + 21 = x

समीकरण को पुनर्व्यवस्थित करने पर: 21 = x - 0.16x = 0.84x

x के लिए हल करने पर: x = 21 / 0.84 = 25

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