30 labourers can built a wall in 9 days. If the same wall is to be bu

1.	30 labourers can built a wall in 9 days. If the same wall is to be built by 20 labourers how many days they will take to complete it? A) 14 B) 13 1/2 C) 16 D) 19 1/2
Answer» Correct option is (B) 13 1/2 Work done to complete the wall = Work done by 30 labourers in 9 days = Work done by 20 labourers in x days \(\therefore 20\times x=30\times9\) \(\Rightarrow x=\frac{30\times9}{20}=\frac{27}2\,days\) \(=13\frac12\,days\) Correct option is B) 13 1/2

30 labourers can built a wall in 9 days. If the same wall is to be built by 20 labourers how many days they will take to complete it? A) 14 B) 13 1/2 C) 16 D) 19 1/2

Answer»

Correct option is (B) 13 1/2

Work done to complete the wall = Work done by 30 labourers in 9 days

= Work done by 20 labourers in x days

\(\therefore 20\times x=30\times9\)

\(\Rightarrow x=\frac{30\times9}{20}=\frac{27}2\,days\) \(=13\frac12\,days\)

Correct option is B) 13 1/2