Aptitude | Arithmetic Aptitude 5 | Question 3

Find a positive number which when increased by 16 is equal to 80 times the reciprocal of the number
(A) 20
(B) -4
(C) -10
(D) 4


Answer: (D)

Explanation:

Let the number be x.
Then x + 16 = 80 * (1/x)
x2 + 16x – 80 = 0
x2 + 20x – 4x – 80 =0
(x + 20) (x -4)
Therefore x = 4


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