Question

15 laboures were employed Zo
build a wall in 28 days .How
many more
Laboures should be
employed to finish the construction
in 21 days?
​

Answer 1

Step-by-step explanation:

$15 \: labours \: can \: build \: a \: wall \: in \: 28days \\ 1 \: labour \: can \: build \: a \: wall \: in \: 28 \times 15 = 420 \: days \\ in \: 21 \: days \: the \: wall \: build \: by \frac{420}{21} = 20 \: labours$