How many packets of \(\dfrac{1}{12}\) kg salt can be made from \(7\dfrac{1}{2}\) kg of salt ?
90
The number of equal packets that can be made from a quantity is the total quantity divided by the quantity in one packet; dividing by a fraction is the same as multiplying by its reciprocal.
Step 1 — Convert the mixed number: \(7\dfrac{1}{2} = \dfrac{15}{2}\) kg.
Step 2 — Number of packets \(= \dfrac{15}{2} \div \dfrac{1}{12} = \dfrac{15}{2} \times 12 = 90\).
72 comes from treating the total as 6 kg, 60 from treating it as 5 kg and 45 from multiplying by 6 instead of 12, so none of them uses the given quantities correctly.
90 option is correct.
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