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GATE Mechanical 2017 Set 2 | GA Question: 7

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$X$ bullocks and $Y$ tractors take $8$ days to plough a field. If we have the number of bullocks and double the number of tractors, it takes $5$ days to plough the same field. How many days will it take $X$ bullocks alone to plough the field?

  1. $30$
  2. $35$
  3. $40$
  4. $45$
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