Number System
- A number is as much greater than 31 is less than 55. The number is ?
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Let the number be x.
Then, x - 31 = 55 - xCorrect Option: D
Let the number be x.
Then, x - 31 = 55 - x
⇒ 2x = 55 + 31= 86
⇒ 2x = 86
∴ x = 43
- 1/4 of a number subtracted from 1/3 of the same number gives 12. The number is ?
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Let the required number is N.
Then, N/3 - N/4 = 12.Correct Option: A
Let the required number is N.
Then, N/3 - N/4 = 12.
⇒ 4N - 3N = 144
∴ N = 144
- 3/4 of a number is 19 less than the original number. The number is ?
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Let the original number be N.
So from question N - 3N/4 = 19Correct Option: C
Let the original number be N.
So from question N - 3N/4 = 19
⇒ 4N - 3N = 76
∴ N = 76
- If one-fifth of a number decreased by 5 is 5, then the number is ?
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Let the number be N.
Then, N/5 - 5 = 5Correct Option: B
Let the number be N.
Then, N/5 - 5 = 5
⇒ N - 25 = 25
∴ N = 50
- A number is 25 more than its two-fifth. The number is ?
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Let the number be N.
So from question 2N/5 + 25 = NCorrect Option: C
Let the number be N.
So from question 2N/5 + 25 = N
⇒ 2N + 125 = 5N
⇒ 3N = 125
∴ N = 125/3