Discussion
How many packets of \(\tfrac{1}{12}\) kg salt can be made from \(7\tfrac{1}{2}\) kg of salt ?
Answer: D
90 packets can be made.
Divide the total salt by the size of one packet:
\[ \begin{aligned} 7\tfrac{1}{2} \div \tfrac{1}{12} &= \tfrac{15}{2} \times 12 \\ &= 15 \times 6 = 90 \end{aligned} \]
Check: each kilogram makes 12 packets, so 7 kg make 84 and the extra half kilogram makes 6 more, 90 in all. 45 is half the answer, as if each kilogram made only 6 packets.
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