Advertisements
Advertisements
प्रश्न
If x varies inversely as y and x = 20 when y = 600, find y when x = 400.
Advertisements
उत्तर
If x varies inversely as y.
∴ xy = k (constant) ...(i)
If x = 20 and y = 600
∴ xy = 20 × 600 = 12000
⇒ k = 12000
When x = 400, then from equation (i),
y × 400 = k
⇒ y × 400 = 12000 ...[Putting the value of k]
⇒ `y = 12000/400 = 30`
APPEARS IN
संबंधित प्रश्न
Which of the following are in inverse proportion?
The time taken for a fixed journey and the speed of the vehicle.
It x and y vary inversely, fill in the following blank:
| x | 12 | 16 | ... | 8 | ... |
| y | ... | 6 | 4 | ... | 0.25 |
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?
A group of 3 friends staying together, consume 54 kg of wheat every month. Some more friends join this group and they find that the same amount of wheat lasts for 18 days. How many new members are there in this group now?
Mohanrao took 10 days to finish a book, reading 40 pages every day. How many pages must be read in a day to finish it in 8 days?
If two quantities p and q vary inversely with each other, then ______
Length of a side of an equilateral triangle and its perimeter vary inversely with each other.
When two quantities are related in such a manner that if one increases and the other decreases, then they always vary inversely.
Two persons could fit new windows in house in 3 days.
How many persons would be needed to fit the windows in one day?
