Advertisements
Advertisements
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?
Advertisements
उत्तर
Let the number of days required by 4 persons to complete the job be x.
The following table is obtained.
| Number of days | 4 | x |
| Number of persons | 3 | 4 |
If the number of persons is more, then it will take less time to complete the job.
Hence, the number of days and the number of persons required to complete the job are inversely proportional to each other.
Therefore,
4 × 3 = x × 4
`x = (4 xx3)/4`
x = 3
Therefore, 4 persons will take 3 days to complete the job.
APPEARS IN
संबंधित प्रश्न
Rehman is making a wheel using spokes. He wants to fix equal spokes in such a way that the angles between any pair of consecutive spokes are equal. Help him by completing the following table:
| Number of spokes | 4 | 6 | 8 | 10 | 12 |
| Angle between a pair of consecutive spokes |
90° | 60° | ... | ... | ... |
- Are the number of spokes and the angles formed between the pairs of consecutive spokes in inverse proportion?
- Calculate the angle between a pair of consecutive spokes on a wheel with 15 spokes.
- How many spokes would be needed if the angle between a pair of consecutive spokes is 40°?
Two persons could fit new windows in house in 3 days.
One of the persons fell ill before the work started. How long would the job take now?
In which of the following table x and y vary inversely:
| x | 9 | 24 | 15 | 3 |
| y | 8 | 3 | 4 | 25 |
If 40 workers can do a project work in 8 days, then _________ workers can do it in 4 days
Neelaveni goes by bicycle to her school every day. Her average speed is 12 km/hr and she reaches school in 20 minutes. What is the increase in speed, If she reaches the school in 15 minutes?
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 x and y are in inverse proportion, then (x + 1) and (y + 1) are also in inverse proportion.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Compound interest on a given sum and the sum invested.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Increase in cost and number of shirts that can be purchased if the budget remains the same.
