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प्रश्न
Rohit bought 12 registers for Rs 156, find the cost of 7 such registers.
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उत्तर
Let the cost of 7 registers be Rs x.
| Register | 12 | 7 |
| Cost(in Rs.) | 156 | x |
\[\text{ If he buys less number of registers, the cost will also be less } . \]
\[\text{ Therefore, it is a direct variation .} \]
\[\text{ We get: } \]
\[12: 7 = 156: x\]
\[ \Rightarrow \frac{12}{7} = \frac{156}{x}\]
\[ \text{ Applying cross muliplication, we get: } \]
\[x = \frac{156 \times 7}{12}\]
\[ = 91\]
\[\text{ Thus, the cost of 7 such registers will be Rs 91 } .\]
संबंधित प्रश्न
In which of the following tables x and y vary directly?
(i)
| a | 7 | 9 | 13 | 21 | 25 |
| b | 21 | 27 | 39 | 63 | 75 |
(ii)
| a | 10 | 20 | 30 | 40 | 46 |
| b | 5 | 10 | 15 | 20 | 23 |
(iii)
| a | 2 | 3 | 4 | 5 | 6 |
| b | 6 | 9 | 12 | 17 | 20 |
(iv)
| a | 12 | 22 | 32 | 42 | 52 |
| b | 13 | 23 | 33 | 43 | 53 |
If two quantities x and y vary directly with each other, then ______
If the distance travelled by a rickshaw in one hour is 10 km, then the distance travelled by the same rickshaw with the same speed in one minute is ______.
x and y are said to vary directly with each other if for some positive number k, ______ = k.
Two quantities x and y are said to vary directly with each other if for some rational number k, xy = k.
When two quantities are related in such a manner that, if one increases, the other also increases, then they always vary directly.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
The quantity of rice and its cost.
A car covers a distance in 40 minutes with an average speed of 60 km/h. What should be the average speed to cover the same distance in 25 minutes?
It is given that l varies directly as m. Find m when l is 8.
A recipe for a particular type of muffins requires 1 cup of milk and 1.5 cups of chocolates. Riya has 7.5 cups of chocolates. If she is using the recipe as a guide, how many cups of milk will she need to prepare muffins?
