Advertisements
Advertisements
Question
If 600 rupees buy 15 bunches of feed, how many will 1280 rupees buy?
Advertisements
Solution 1
Let us suppose x bunches of feed can be bought for 1280 rupees.
The number of bunches of feed and their cost vary in direct proportion.
∴ `15/600 = "x"/1280`
⇒ x = `(15 xx 1280)/600`
⇒ x = `(15 xx128)/60`
⇒ x = `(1920)/60`
x = 32
Hence, 32 bunches of feed can be bought for 1280 rupees.
Solution 2
We are given that 600 rupees can buy 15 bunches of feed.
First, find the cost of 1 bunch:
⇒ `600/15 = 40` rupees per bunch
Now, calculate how many bunches 1280 rupees can buy:
⇒ `1280/40 = 32`
Thus, 1280 rupees can buy 32 bunches of feed.
RELATED QUESTIONS
In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?
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).
68 boxes of a certain commodity require a shelf-length of 13.6 m. How many boxes of the same commodity would occupy a shelf length of 20.4 m?
The amount of extension in an elastic spring varies directly with the weight hung on it. If a weight of 250 gm produces an extension of 3.5 cm, find the extension produced by the weight of 700 gm.
In 15 days, the earth picks up 1.2 × 108 kg of dust from the atmosphere. In how many days it will pick up 4.8 × 108 kg of dust?
A and B can polish the floors of a building in 10 days. A alone can do \[\frac{1}{4}\] th of it in 12 days. In how many days can B alone polish the floor ?
If x varies directly as y, then
| x | 12 | 6 |
| y | 48 | – |
It is given that l varies directly as m. Find the constant of proportion (k), when l is 6 then m is 18.
Here is a key board of a harmonium:
- Find the ratio of white keys to black keys on the keyboard.
- What is the ratio of black keys to all keys on the given keyboard.
- This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.
Here is a keyboard of a harmonium: What is the ratio of black keys to all keys on the given keyboard.
