Question

6 labourers can build a wall in 10 days. How many labourers of double the efficiency, are required to build 3 such walls in 5 days

Answer 1

Process

days. 10. 5

wall. 1. 3

labours 6. ?=(X) let

therefore

$x = 6 \times \frac{10}{5} \times \frac{3}{1} \\ x = 36$

so 36 labours are needed but if the efficiency is doubled for each labour the the no.of labours required=36/2=18