Advertisements
Advertisements
प्रश्न
10 farmers can plough a field in 21 days. Find the number of days reduced if 14 farmers ploughed the same field?
Advertisements
उत्तर
Let the required number of days if 14 farmers ploughed = x
| Number of days | 21 | x |
| Number of farmers | 10 | 14 |
As number of farmers increases, number of days decreases.
∴ They are in inverse proportion
x1y1 = x2y2
21 × 10 = x × 14
x = `(21 xx 10)/14`
x = 15
Initially the farmers worked for 21 days.
Now they worked for 15 days.
∴ The number of days reduced = 21 – 15 = 6 days
APPEARS IN
संबंधित प्रश्न
A batch of bottles was packed in 25 boxes with 12 bottles in each box. If the same batch is packed using 20 bottles in each box, how many boxes would be filled?
Which of the following quantities vary inversely as other?
The number of x men hired to construct a wall and the time y taken to finish the job.
It is known that for a given mass of gas, the volume v varies inversely as the pressure p. Fill in the missing entries in the following table:
| v (in cm3) | ... | 48 | 60 | ... | 100 | ... | 200 |
| p (in atmospheres) | 2 | ... | 3/2 | 1 | ... | 1/2 | ... |
If 36 men can do a piece of work in 25 days, in how many days will 15 men do it?
A car can finish a certain journey in 10 hours at the speed of 48 km/hr. By how much should its speed be increased so that it may take only 8 hours to cover the same distance?
Three spraying machines working together can finish painting a house in 60 minutes. How long will it take for 5 machines of the same capacity to do the same job?
Mary cycles at 6 km per hour. How long will she take to reach her Aunt’s house which is 12 km away? If she cycles at a speed of 4 km/hr, how long would she take?
Meena had enough money to send 8 parcels each weighing 500 grams through a courier service. What would be the weight of each parcel, if she has to send 40 parcels for the same money?
If a tree 24 m high casts a shadow of 15 m, then the height of a pole that casts a shadow of 6 m under similar conditions is 9.6 m.
A contractor undertook a contract to complete a part of a stadium in 9 months with a team of 560 persons. Later on, it was required to complete the job in 5 months. How many extra persons should he employ to complete the work?
