Advertisements
Advertisements
प्रश्न
Ten men take 4 days to complete the task of tarring a road. How many days would 8 men take?
Advertisements
उत्तर
| Number of men | Number of days |
| 10 | 4 |
| 8 | x |
More the men lesser the number of days required to finish the work.
So, the number of men and the number of days required to complete the work are inversely proportional to each other.
`10/8 = "x"/4`
`=> "x" = (10 xx 4)/8`
⇒ x = 5
Thus, when 8 men are involved so, 5 days will be required.
APPEARS IN
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 | .... | .... | .... | .... |
In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?
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?
The cost of 12 quintals of soyabean is 36,000 rupees. How much will 8 quintals cost?
If C = kd
(i) what is the relation between C and d?
(ii) find k when C = 30 and d = 6
(iii) find C, when d = 10
On increasing a, b increases in such a manner that `a/b` remains ______ and positive, then a and b are said to vary directly with each other.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Income tax and the income.
If 25 metres of cloth costs Rs 337.50, then what will be the length of the cloth bought for Rs 810?
A bowler throws a cricket ball at a speed of 120 km/h. How long does this ball take to travel a distance of 20 metres to reach the batsman?
Here is a key board of a harmonium:
- Find the ratio of white keys to black keys on the keyboard.

- What is the ratio of black keys to all keys on the given keyboard.
- 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.
