Quiz Discussion

A can do a certain job in 12 days and B is 60% more efficient than A. The B can do the same piece of work in ?

• 1]

  ${ \text{8 days}}$

• 2]

  ${ \text{7}}\frac{1}{2}{ \text{ days}}$

• 3]

  ${ \text{6}}\frac{1}{4}{ \text{ days}}$

• 4]

  ${ \text{6 days}}$

A man and a boy can do a piece of work in 24 days. If the man works alone for the last 6 days, it is completed in 26 days. How long would the boy take to do it alone ?

• 1] 20 days
• 2] 24 days
• 3] 36 days
• 4] 72 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]

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

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in:

• 1] 7.5 hr
• 2] 8 hr
• 3] 8.5 hr
• 4] 10 hr

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

• 1]

  $\frac{1}{4}$

• 2]

  $\frac{1}{{10}}$

• 3]

  $\frac{7}{{15}}$

• 4]

  $\frac{8}{{15}}$