Question

12 labourers can build a wall in 10 days Find the number of labourers to complete the wall in 6 days​

Answer 1

Step-by-step explanation:

The rate of 6 labourers is 1/10 and thus the rate of 1 labourer is (1/10)/6 = 1/60. If a labourer doubles his or her efficiency, a more efficient labourer will have a rate of 1/60 x 2 = 1/30. Let there be n labourers with double efficiency, building 3 walls in 5 days means their combined rate is 3/5. Therefore, we can create the equation:

n x 1/30 = 3/5

n = 3/5 x 30

n = 18