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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 |
\[\text{ If he buys less number of registers, the cost will also be less } . \]
\[\text{ Therefore, it is a direct variation .} \]
\[\text{ We get: } \]
\[12: 7 = 156: x\]
\[ \Rightarrow \frac{12}{7} = \frac{156}{x}\]
\[ \text{ Applying cross muliplication, we get: } \]
\[x = \frac{156 \times 7}{12}\]
\[ = 91\]
\[\text{ Thus, the cost of 7 such registers will be Rs 91 } .\]
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