Advertisements
Advertisements
प्रश्न
It takes 120 minutes to weed a garden with 6 gardeners. If the same work is to be done in 30 minutes, how many more gardeners are needed?
Advertisements
उत्तर
Let the, number of gardeners needed be x.
| Number of gardeners | 6 | x |
| Time in minutes | 120 | 30 |
As the number of gardeners increases the time decreases.
They are in inverse proportion,
x1y1 = x2y2
6 × 120 = x × 30
x = `(6 xx 120)/30`
x = 24
∴ To complete the work in 30 min gardeners needed = 24
Already existing gardeners = 6
∴ More gardeners needed = 24 – 6 = 18
18 more gardeners are needed
APPEARS IN
संबंधित प्रश्न
Which of the following are in inverse proportion?
The population of a country and the area of land per person.
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.
A work-force of 420 men with a contractor can finish a certain piece of work in 9 months. How many extra men must he employ to complete the job in 7 months?
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?
18 men can reap a field in 35 days. For reaping the same field in 15 days, how many men are required?
4 typists are employed to complete a work in 12 days. If two more typists are added, they will finish the same work in _________ days
If one angle of a triangle is kept fixed then the measure of the remaining two angles vary inversely with each other.
If x varies inversely as y and x = 20 when y = 600, find y when x = 400.
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?
The variable x is inversely proportional to y. If x increases by p%, then by what per cent will y decrease?
