Question

16 workers take 48 hrs to build a wall. 4 of them left. more are needed to complete the work in 32 hours. (3 marks)

Answer 1

Given that 16 workers take 48 hours to build the wall. If the time is reduced to 32 hours, then let the number of workers required be y.
$16\times 48=$ $y\times 32$
$y=24$ (1.5 marks)
Now, if 4 workers left, the remaining number of workers at the site is $16-4=12$
Thus, additional number of workers required will be
$24-12=12$
(1.5 marks)