Advertisements
Advertisements
प्रश्न
Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow it in 4 hours. How long will Sohan take to mow the lawn if he works alone?
Advertisements
उत्तर
\[\text{ Time taken by Mohan to do the work = 9 hours} \]
\[\text{ Time taken by Mohan and Sohan to do the work = 4 hours } \]
\[ \therefore \text{ Work done by Mohan } = \frac{1}{9}\]
\[\text{ Work done by Mohan and Sohan } = \frac{1}{4}\]
\[ \therefore \text{ Work done by Sohan } = \frac{1}{4} - \frac{1}{9}\]
\[ = \frac{9 - 4}{36} = \frac{5}{36}\]
\[\text{ Thus, Sohan can do the work in } \frac{36}{5} \text{ hours i . e } . 7\frac{1}{5}\text{ hours } .\]
APPEARS IN
संबंधित प्रश्न
Explain the concept of direct variation.
Complite the following table given that x varies directly as y .
| x | 4 | 9 | ... | ... | 3 | ... |
| y | 16 | ... | 48 | 36 | ... | 4 |
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?
In 15 days, the earth picks up 1.2 × 108 kg of dust from the atmosphere. In how many days it will pick up 4.8 × 108 kg of dust?
A pipe can fill a cistern in 10 hours. Due to a leak in the bottom it is filled in 12 hours. When the cistern is full, in how much time will it be emptied by the leak?
Assuming land to be uniformly fertile, the area of land and the yield on it vary ______
Both x and y vary directly with each other and when x is 10, y is 14, which of the following is not a possible pair of corresponding values of x and y?
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
The number of people working and the quantity of work.
There are 20 grams of protein in 75 grams of sauted fish. How many grams of protein is in 225 gm of that fish?
Here is a keyboard of a harmonium: This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.
