Advertisements
Advertisements
प्रश्न
Anil can do a piece of work in 5 days and Ankur in 4 days. How long will they take to do the same work, if they work together?
उत्तर
\[\text{ Time taken by Anil to do the work = 5 days } \]
\[\text{ Time taken by Ankur to do the work = 4 days } \]
\[ \therefore \text{ Work done by Anil in 1 day } = \frac{1}{5}\]
\[\text{ Work done by Ankur in 1 day } = \frac{1}{4}\]
\[ \therefore \text{ Work done by Anil and Ankur in one day } = \frac{1}{5} + \frac{1}{4}\]
\[ = \frac{4 + 5}{20} = \frac{9}{20}\]
\[\text{ Thus, Anil and Ankur can do the work in } \frac{20}{9} \text{ days i } . e . 2\frac{2}{9} \text{ days } \]
APPEARS IN
संबंधित प्रश्न
A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the length of the shadow cast by another pole 10 m 50 cm high.
Complite the following table given that x varies directly as y .
| x | 3 | 5 | 7 | 9 |
| y | ... | 20 | 28 | ... |
A, B and C working together can do a piece of work in 8 hours. A alone can do it in 20 hours and B alone can do it in 24 hours. In how many hours will C alone do the same work?
6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?
If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?
A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6 hours. How long will it take to fill the cistern if both the tap and the pipe are opened together?
Expenditure of a family to number of members of the family are in direct proportion
The number of teeth and the age of a person vary ______
If x and y are in direct proportion, then (x – 1) and (y – 1) are also in direct proportion.
If 25 metres of cloth costs Rs 337.50, then what will be the cost of 40 metres of the same type of cloth?
