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Difficulty: 3/102022 NMTC 2022 (QII-42)

The three numbers are in the ratio 1/2 : 2/3 : 3/4. The difference between greatest and smallest numbers is 36. Find the numbers

Guide / Hint

Hint 1: Multiply the fractional ratios by the LCM of the denominators (12) to get integer ratios: .

Hint 2: Represent the numbers as , and set up the difference equation: .

Hint 3: Solve for , then multiply by 6, 8, and 9 to find the numbers.

Solution

Step 1 (Convert Fractional Ratios to Integers): We are given the ratio of three numbers:

To convert this to an integer ratio, we multiply each term by the Least Common Multiple (LCM) of the denominators , which is :

  • First term:

  • Second term:

  • Third term:

So the integer ratio is .

Step 2 (Formulate Equations using variables): Let the three numbers be , , and . The smallest number is and the greatest is .
We are given that the difference between the greatest and smallest numbers is 36:

Step 3 (Compute the Numbers):

  • First number:

  • Second number:

  • Third number:

Step 4 (Conclusion): The three numbers are exactly 72, 96, 108.

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