Advertisements
Advertisements
Question
From the following table, determine if x and y are in direct proportion or not.
| x | 3 | 6 | 15 | 20 | 30 |
| y | 12 | 24 | 45 | 60 | 120 |
Advertisements
Solution
In direct proportion, `x/y = k` ...(Constant)
For table
| x | 3 | 6 | 15 | 20 | 30 |
| y | 12 | 24 | 45 | 60 | 120 |
⇒ `x/y = 3/12, 6/24, 15/45, 20/60, 30/120`
i.e. `1/4, 1/4, 1/3, 1/3, 1/4`
So, is not in direct proportion.
APPEARS IN
RELATED QUESTIONS
Suneeta types 1080 words in one hour. What is her GWAM (gross words a minute rate)?
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 ?
8 men can do a piece of work in 9 days. In how many days will 6 men do it?
A birthday party is arranged in third floor of a hotel. 120 people take 8 trips in a lift to go to the party hall. If 12 trips were made how many people would have attended the party?
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
The number of teeth and the age of a person vary ______
When the speed remains constant, the distance travelled is ______ proportional to the time.
On increasing a, b increases in such a manner that `a/b` remains ______ and positive, then a and b are said to vary directly with each other.
It is given that l varies directly as m. Find m when l is 8.
A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many such pumps are required if the pool is to be filled in `2 2/3` hours?
