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
A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?
It x and y vary inversely, fill in the following blank:
| x | 12 | 16 | ... | 8 | ... |
| y | ... | 6 | 4 | ... | 0.25 |
Which of the following quantities vary inversely as other?
Journey (x km) undertaken by a car and the petrol (y litres) consumed by it.
If 40 workers can do a project work in 8 days, then _________ workers can do it in 4 days
Six men can complete a work in 12 days. Two days later, 6 more men joined them. How many days will they take to complete the remaining work?
Which of the following vary inversely with each other?
When two quantities x and y are in ______ proportion or vary ______ they are written as `x oo 1/y`.
If x varies inversely as y and x = 4 when y = 6, then when x = 3 the value of y is ______.
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.
The variable x is inversely proportional to y. If x increases by p%, then by what per cent will y decrease?
