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.
- A.
81
- B.
25
- C.
18
- D.
64
Attempted by 110 students.
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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