Advertisements
Advertisements
प्रश्न
In a school there is 7 periods a day each of 45 minutes duration. How long each period is if the school has 9 periods a day assuming the number of hours to be the same?
Advertisements
उत्तर
Number of periods increases as duration decreases, since the number of hours is same.
Let the duration of each period be x.
| Number of periods | 7 | 9 |
| Duration of period (min) | 45 | x |
x1y1 = x2y2
7 × 45 = 9 × x
x = `(7 xx 45)/9`
x = 35
Duration of every period = 35 min
APPEARS IN
संबंधित प्रश्न
Find the constant of variation from the table given below:
| x | 3 | 5 | 7 | 9 |
| y | 12 | 20 | 28 | 36 |
Set up a table and solve the following problems. Use unitary method to verify the answer.
A car can finish a certain journey in 10 hours at the speed of 48 km/hr. By how much should its speed be increased so that it may take only 8 hours to cover the same distance?
55 cows can graze a field in 16 days. How many cows will graze the same field in 10 days?
Three persons can build a small house in 8 days. To build the same house in 6 days, how many persons are required?
Mary cycles at 6 km per hour. How long will she take to reach her Aunt’s house which is 12 km away? If she cycles at a speed of 4 km/hr, how long would she take?
Meena had enough money to send 8 parcels each weighing 500 grams through a courier service. What would be the weight of each parcel, if she has to send 40 parcels for the same money?
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?
If x varies inversely as y, then
| x | – | 60 |
| y | 2 | 10 |
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
The height of a tree and the number of years.
Find the values of x and y if a and b are in inverse proportion:
- 12 x 8
- 30 5 y
