Advertisements
Advertisements
प्रश्न
The variable x varies directly as y and x = 80 when y is 160. What is y when x is 64?
उत्तर
If x varies directly as y.
∴ `x/y = k` (constant) ...(i)
If x = 80 and y = 160
∴ `x/y = 80/160 = 1/2`
⇒ `k = 1/2`
When x = 64, then from equation (i),
`64/y = 1/2` ...[Putting the value of k]
⇒ y = 64 × 2 = 128
APPEARS IN
संबंधित प्रश्न
11 men can dig \[6\frac{3}{4}\] metre long trench in one day. How many men should be employed for digging 27 metre long trench of the same type in one day?
Sita can finish typing a 100 page document in 9 hours. Mita in 6 hours and Rita in 12 hours. How long will they take to type a 100 page document if they work together?
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?
Both x and y vary inversely with each other. When x is 10, y is 6, which of the following is not a possible pair of corresponding values of x and y?
Two quantities are said to vary ______ with each other if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.
It is given that l varies directly as m. Find m when l is 8.
From the following table, determine if x and y are in direct proportion or not.
| x | 1 | 4 | 9 | 20 |
| y | 1.5 | 6 | 13.5 | 30 |
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 E | Mixture F |
 |
 |
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?
Here is a keyboard of a harmonium: What is the ratio of black keys to all keys on the given keyboard.
