Advertisements
Advertisements
प्रश्न
A printer, prints a book of 300 pages at the rate of 30 pages per minute. Then, how long will it take to print the same book if the speed of the printer is 25 pages per minute?
उत्तर
Let the required time taken to print be x
As the speed increases time taken to print decreases
∴ They are in inverse proportion
Time taken to print 30 pages = 1 min
∴ Time taken to print 300 pages = `300/30` = 10 min
| Time taken to print (in minutes) | 10 | x |
| Number of pages printed per minutes | 30 | 25 |
x1y1 = x2y2
10 × 30 = x × 25
x = `(30 xx 10)/25` = 12 min
Time taken to print = 12 min
APPEARS IN
संबंधित प्रश्न
Which of the following are in inverse proportion?
The number of workers on a job and the time to complete the job.
In a Television game show, the prize money of Rs 1,00,000 is to be divided equally amongst the winners. Complete the following table and find whether the prize money given to an individual winner is directly or inversely proportional to the number of winners?
| Number of winners | 1 | 2 | 4 | 5 | 8 | 10 | 20 |
| Prize for each winner (in Rs) | 1,00,000 | 50,000 | ... | ... | ... | ... | ... |
In which of the following table x and y vary inversely:
| x | 9 | 24 | 15 | 3 |
| y | 8 | 3 | 4 | 25 |
If 36 men can do a piece of work in 25 days, in how many days will 15 men do it?
1200 soldiers in a fort had enough food for 28 days. After 4 days, some soldiers were transferred to another fort and thus the food lasted now for 32 more days. How many soldiers left the fort?
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?
x varies inversely as twice of y. Given that when y = 6, the value of x is 4. Find the value of x when y = 8
10 farmers can plough a field in 21 days. Find the number of days reduced if 14 farmers ploughed the same field?
In case of inverse proportion, `a_2/- = b_2/-`
Length of a side of an equilateral triangle and its perimeter vary inversely with each other.
