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?
Advertisements
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?
Area of cultivated land and the crop harvested
In which of the following table x and y vary inversely:
| x | 4 | 3 | 6 | 1 |
| y | 9 | 12 | 8 | 36 |
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?
If x and y vary inversely as other and x = 3 when y = 8, find y when x = 4 .
If x and y vary inversely as other and x = 30, find y when constant of variation = 900.
Three persons can build a small house in 8 days. To build the same house in 6 days, how many persons are required?
If two quantities p and q vary inversely with each other then ______ of their corresponding values remains constant.
If one angle of a triangle is kept fixed then the measure of the remaining two angles vary inversely with each other.
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.
If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.
| a | 6 | 8 | q | 25 |
| b | 18 | p | 39 | r |
