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GATE ECE 2010 | Question-63

$5$ skilled workers can build a wall in $20$ days: $8$ semi-skilled workers can build a wall in $25$ days: $10$ unskilled workers can build a wall in $30$ days. If a team has $2$ skilled, $6$ semi-skilled and $5$ unskilled workers, how long will it take to build the wall?

  1. $20$ days
  2. $18$ days
  3. $16$ days
  4. $15$ days
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