Question:
Mark (✓) against the correct answer:
14 workers can build a wall in 42 days. One worker can build it in
(a) 3 days
(b) 147 days
(c) 294 days
(d) 588 days
Solution:
(d) 588 days
Let one worker take x days to build the wall.
Clearly, one worker will take more days to finish the work.
So, it is a case of inverse proportion
Now, $14 \times 42=1 \times x$
$\Rightarrow x=14 \times 42$
$\Rightarrow x=588$
∴ One worker can build the wall in 588 days.