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The age of a son, who is more than two years old, is equal to the units digit of the age of his father. After ten years, the age of the father will be thrice the age of the son. What is the sum of the present ages of the son and the father?

  1. $30$ years
  2. $36$ years
  3. $40$ years
  4. Cannot be determined
in Quantitative Aptitude 2.4k points 72 137 235
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36
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