Quiz Discussion

If the work done by (x - 1) men in (x + 1) days and the work done by (x + 2) men in (x - 1) days are in the ratio 9 : 10, then the value of x is equal to ?

• 1] 5
• 2] 6
• 3] 7
• 4] 8

A and B completed a work together in 5 days. had A worked at twice the speed and B at half the speed, it would have taken them four days to complete the job. How much time would it take for A alone to do the work?

• 1] 10 days
• 2] 20 days
• 3] 25 days
• 4] 15 days
• 5] 24 days

Raj can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijit joined and completed it working for 10 days. In how many days Raj and Abhijit can do the complete work, working together?

• 1] 6
• 2] 8
• 3] 10
• 4] 12

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]

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

Vimal can do a piece of work in 20 days, Vimal and Kamal together can do in 12 days. If Kamal does the work only for half a day daily then in how many days the work will be completed ?

• 1] 14
• 2] 17
• 3] 12
• 4] 15