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?
Advertisements
उत्तर
\[\text{ Time taken by Anil to do the work = 5 days } \]
\[\text{ Time taken by Ankur to do the work = 4 days } \]
\[ \therefore \text{ Work done by Anil in 1 day } = \frac{1}{5}\]
\[\text{ Work done by Ankur in 1 day } = \frac{1}{4}\]
\[ \therefore \text{ Work done by Anil and Ankur in one day } = \frac{1}{5} + \frac{1}{4}\]
\[ = \frac{4 + 5}{20} = \frac{9}{20}\]
\[\text{ Thus, Anil and Ankur can do the work in } \frac{20}{9} \text{ days i } . e . 2\frac{2}{9} \text{ days } \]
संबंधित प्रश्न
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of the base that need to be added.
| Parts of red pigment | 1 | 4 | 7 | 12 | 20 |
| parts of base | 8 | .... | .... | .... | .... |
Complite the following table given that x varies directly as y .
| x | 3 | 5 | 7 | 9 |
| y | ... | 20 | 28 | ... |
In a library 136 copies of a certain book require a shelf-length of 3.4 metre. How many copies of the same book would occupy a shelf-length of 5.1 metres?
A worker is paid Rs 210 for 6 days work. If his total income of the month is Rs 875, for how many days did he work?
A and B can do a piece of work in 20 days and B in 15 days. They work together for 2 days and then A goes away. In how many days will B finish the remaining work?
When two quantities are related in such a manner that, if one increases, the other also increases, then they always vary directly.
A car covers a distance in 40 minutes with an average speed of 60 km/h. What should be the average speed to cover the same distance in 25 minutes?
Campus and Welfare Committee of school is planning to develop a blue shade for painting the entire school building. For this purpose various shades are tried by mixing containers of blue paint and white paint. In the following mixtures, decide which is a lighter shade of blue and also find the lightest blue shade among all of them.
| Mixture C | Mixture D |
 |
 |
If one container has one litre paint and the building requires 105 litres for painting, how many container of each type is required to paint the building by darkest blue shade?
Ms. Anita has to drive from Jhareda to Ganwari. She measures a distance of 3.5 cm between these villages on the map. What is the actual distance between the villages if the map scale is 1 cm = 10 km?
A recipe for a particular type of muffins requires 1 cup of milk and 1.5 cups of chocolates. Riya has 7.5 cups of chocolates. If she is using the recipe as a guide, how many cups of milk will she need to prepare muffins?
