Question:
Rohit bought 12 registers for Rs 156, find the cost of 7 such registers.
Solution:
Let the cost of 7 registers be Rs x.
If he buys less number of registers, the cost will also be less.
Therefore, it is a direct variation.
We get:
$12: 7=156: x$
$\Rightarrow \frac{12}{7}=\frac{156}{x}$
Applying cross muliplication, we get:
$x=\frac{156 \times 7}{12}$
$=91$
Thus, the cost of 7 such registers will be Rs 91 .
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