Advertisements
Advertisements
प्रश्न
A group of 21 students paid ₹ 840 as the entry fee for a magic show. How many students entered the magic show if the total amount paid was ₹ 1680?
Advertisements
उत्तर
Let the required number of students be x.
| Number of students | 21 | x |
| Entry fees in ₹ | 840 | 1680 |
As the number of students increases the entry fees also increases.
∴ They are in direct proportion.
∴ `(x_1)/(y_1) = (x_2)/(y_2)`
`21/840 = x/1680`
x = `(21 xx 1680)/840`
x = 42.
∴ The number of students entered magic show = 42
APPEARS IN
संबंधित प्रश्न
Which of the following quantities vary directly with each other?
(i) Number of articles (x) and their price (y).
(ii) Weight of articles (x) and their cost (y).
(iii) Distance x and time y, speed remaining the same.
(iv) Wages (y) and number of hours (x) of work.
(v) Speed (x) and time (y) (distance covered remaining the same).
(vi) Area of a land (x) and its cost (y).
The second class railway fare for 240 km of Journey is Rs 15.00. What would be the fare for a journey of 139.2 km?
A, B and C working together can do a piece of work in 8 hours. A alone can do it in 20 hours and B alone can do it in 24 hours. In how many hours will C alone do the same work?
A can do a piece of work in 40 days and B in 45 days. They work together for 10 days and then B goes away. In how many days will A finish the remaining work?
8 men can do a piece of work in 9 days. In how many days will 6 men do it?
Two mobiles cost 16,000 rupees. How much money will be required to buy 13 such mobiles?
A truck needs 54 litres of diesel for covering a distance of 297 km. The diesel required by the truck to cover a distance of 550 km is ______.
When two quantities x and y are in ______ proportion or vary ______ they are written as `x oo y`.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Number of students in a hostel and consumption of food.
There are 20 grams of protein in 75 grams of sauted fish. How many grams of protein is in 225 gm of that fish?
