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      Question

      Find the largest number that, when dividing 259, 323,

      and 640, leaves remainders of 4, 8, and 10, respectively.
      A 25 Correct Answer Incorrect Answer
      B 19 Correct Answer Incorrect Answer
      C 17 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer

      Solution

      The required number will divide 255 (259 - 4) , 315 (323 - 8) and 630 (640 - 10) completely.

      Now, the greatest number that will divide 255, 315 and 630 completely, is the HCF of these numbers.

      255 = 3 X 5 X 17

      315 = 32ย X 5 X 7

      630 = 2 x 32ย x 5 x 7

      So, HCF of 255, 315 and 630 = 3 x 5 = 15

      Therefore, required number is 15.

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