Advertisements
Advertisements
प्रश्न
10 farmers can plough a field in 21 days. Find the number of days reduced if 14 farmers ploughed the same field?
Advertisements
उत्तर
Let the required number of days if 14 farmers ploughed = x
| Number of days | 21 | x |
| Number of farmers | 10 | 14 |
As number of farmers increases, number of days decreases.
∴ They are in inverse proportion
x1y1 = x2y2
21 × 10 = x × 14
x = `(21 xx 10)/14`
x = 15
Initially the farmers worked for 21 days.
Now they worked for 15 days.
∴ The number of days reduced = 21 – 15 = 6 days
APPEARS IN
संबंधित प्रश्न
A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same?
Which of the following quantities vary inversely as other?
The length x of a journey by bus and price y of the ticket.
A work force of 50 men with a contractor can finish a piece of work in 5 months. In how many months the same work can be completed by 125 men?
Raghu has enough money to buy 75 machines worth Rs 200 each. How many machines can he buy if he gets a discount of Rs 50 on each machine?
The stock of grain in a government warehouse lasts 30 days for 4000 people. How many days will it last for 6000 people?
6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only 5 pipes of the same type are used?
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`.
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.
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.
