Question

if 12 workers can build a wall in 48h, how many workers will be required to do the same work in 54h

Answer 1

if 12 workers can build in - 48 hrs....
then
in 54 - hrs

= 54× 12/ 48
= 13.5

Answer 2

time taken by 1 worker =48/12
=4h
no: of workers required to do the same work
in 54h =54/4
=27/2