Quiz Discussion

18 men or 36 boys working 6 hours a day can plough a field in 24 days. In how many days will 24 men and 24 boys working 9 hours a day plough the same field ?

• 1] 9 days
• 2] 10 days
• 3] 6 days
• 4] 8 days

45 men can complete a piece of work in 16 days. Four days they started working , 36 more men joined them. How many days will they take to complete the remaining work ?

• 1]

  6 days

• 2]

  8 days

• 3]

  ${ \text{6}}\frac{2}{3}{ \text{ days}}$

• 4]

  ${ \text{7}}\frac{3}{4}{ \text{ days}}$

If m men can do a work in r days, then the number of days taken by (m + n) men to do it is :

• 1]

  $\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mn}}}}$

• 2]

  $\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mr}}}}$

• 3]

  $\frac{{{ \text{mr}}}}{{{ \text{m}} + { \text{n}}}}$

• 4]

  $\frac{{{ \text{r}}\left( {{ \text{m}} + { \text{n}}} \right)}}{{{ \text{mn}}}}$

A group of workers was put on a job. From second day onwards, one worker was withdrawn each day. The job was finished when the last worker was withdrawn. Had no worker been withdrawn at any stage, the group would have finished the job in 55% of the time. How many workers were there in the group?

• 1] 15
• 2] 14
• 3] 12
• 4] 10
• 5] 8

A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in :

• 1]

  4 days

• 2]

  6 days

• 3]

  8 days

• 4]

  18 days