Multiple choice general knowledge math & puzzles

Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.

  1. 3

  2. 10

  3. 17

  4. 20
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let the number be x. Then x + 17 = 60/x, giving x² + 17x - 60 = 0. Solving: x = (-17 ± √(289 + 240))/2 = (-17 ± √529)/2 = (-17 ± 23)/2. The positive solution is x = (-17 + 23)/2 = 6/2 = 3. Option A is correct.

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