A school orders pens and notebooks. Each pen costs ₹5, each notebook costs ₹12, and the total bill is ₹120. If $p$ is the number of pens and $n$ is the number of notebooks, which interpretation of the 12 in $5p + 12n = 120$ is correct?
AThe total number of notebooks ordered is 12
BThe total bill spent on notebooks is ₹12
CThe number of pens equals 12 minus the notebooks
DThe cost of each notebook is ₹12
Answer & Solution
Correct answer: D. The cost of each notebook is ₹12
In $5p + 12n = 120$, the coefficient 12 multiplies $n$ (the count of notebooks) to give the cost contributed by notebooks. So 12 is the per-notebook cost in rupees. The number of notebooks is $n$, not 12.
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