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

A can finish a work in 18 days and B can do the same work in 15 days. B worked for 10 days and left the job. In how many days, A alone can finish the remaining work?

• 1]

  5

• 2]

  5 1/2

• 3]

  6

• 4]

  8

A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work. A leaves off. The total number of days to complete the work is ?

• 1]

  ${ \text{6}}\frac{3}{5}$

• 2]

  ${ \text{8}}\frac{1}{2}$

• 3]

  ${ \text{10}}\frac{1}{5}$

• 4]

  ${ \text{13}}\frac{1}{2}$

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, B and C can complete a piece of work in 24, 5 and 12 days respectively. Working together, they will complete the same work in ?

• 1]

  $\frac{7}{{24}}{ \text{days}}$

• 2]

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

• 3]

  4 days

• 4]

  ${ \text{3}}\frac{1}{{13}}{ \text{days}}$