Multiple choice general knowledge math & puzzles

The difference of 2 positive numbers is 80 and quotient obtained on dividing the one by the other is 9. Find the first number.

  1. 75

  2. 90

  3. 10

  4. 80
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B Correct answer
Explanation

Let the numbers be x and y where x > y. From the problem: x - y = 80 and x/y = 9, so x = 9y. Substituting: 9y - y = 80, giving 8y = 80, so y = 10 and x = 90. The first number (x) is 90.

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