Advertisements
Advertisements
Question
If two quantities x and y vary directly with each other, then ______
Options
`x/y` remains constant.
x – y remains constant.
x + y remains constant.
x × y remains constant.
Advertisements
Solution
If two quantities x and y vary directly with each other, then `underlinebb(x/y "remains constant")`.
Explanation:
If two quantities x and y vary directly with each other, then `x/y` = k = constant.
Since, in direct proportion, both x and y increases or decreases together such a manner that the ratio of their corresponding value remains constant.
Hence, `x/y` remains constant.
APPEARS IN
RELATED QUESTIONS
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?
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?
A cistern has two inlets A and B which can fill it in 12 hours and 15 hours respectively. An outlet can empty the full cistern in 10 hours. If all the three pipes are opened together in the empty cistern, how much time will they take to fill the cistern completely?
Distance travelled by a bus and time taken are in direct proportion
By travelling at a speed of 48 kilometres per hour, a car can finish a certain journey in 10 hours. To cover the same distance in 8 hours, the speed of the car should be ______.
If x and y are in direct proportion, then (x – 1) and (y – 1) are also in direct proportion.
For fixed time period and rate of interest, the simple interest is directly proportional to the principal.
From the following table, determine if x and y are in direct proportion or not.
| x | 4 | 7 | 10 | 16 |
| y | 24 | 42 | 60 | 96 |
Campus and Welfare Committee of school is planning to develop a blue shade for painting the entire school building. For this purpose various shades are tried by mixing containers of blue paint and white paint. In the following mixtures, decide which is a lighter shade of blue and also find the lightest blue shade among all of them.
| Mixture G | Mixture H |
 |
 |
If one container has one litre paint and the building requires 105 litres for painting, how many container of each type is required to paint the building by darkest blue shade?
