Advertisements
Advertisements
प्रश्न
If C = kd
(i) what is the relation between C and d?
(ii) find k when C = 30 and d = 6
(iii) find C, when d = 10
उत्तर
(i) Given C = kd
⇒ `"C"/"d"` = k
This is in the form `x/y` = k
As C increases d also increases
∴ It is direct proportion
(ii) When C = 30 and d = 6, k = `"C"/"d"`
= `30/6`
k = 5
(iii) When d = 6, C = 30 ...[from (ii)]
When d = 10, C = ?
`("C"_1)/("d"_1) = ("C"_2)/("d"_2)`
`30/6 = ("C"_2)/10` .......[When d = 10]
C2 = `(30 xx 10)/6`
C2 = 50
C = 50
APPEARS IN
संबंधित प्रश्न
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram. What is the actual length of the bacteria? If the photograph is enlarged 20,000 times only, what would be its enlarged length?
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?
Rakesh can do a piece of work in 20 days. How much work can he do in 4 days?
Reema weaves 35 baskets in 25 days. In how many days will she weave 55 baskets?
Working 8 hours a day, Ashu can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?
If 600 rupees buy 15 bunches of feed, how many will 1280 rupees buy?
Distance travelled by a bus and time taken are in direct proportion
A car is travelling 48 km in one hour. The distance travelled by the car in 12 minutes is ______.
When the distance is kept fixed, speed and time vary directly with each other.
Here is a keyboard of a harmonium: 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.
