Question 38
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Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ?
- A 5 Correct
- B 4
- C 7
- D 6
Correct Answer: Option A
Let the number be x. Then,
- 4x = x + 50
- 5x - 50 = 0
(3x + 10)(x - 5) = 0
x = 5
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