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Earlier discussion
1 older comment kept for context.
David Gomba
This is inverse proportion.
If 15 cans are needed by 7 adults for 2 days
1 can will be \(\frac{15 \times 7}{2} = 52.5\)
Then, 4 adults for 7 days = \(\frac{52.5 \times 4}{7} = 30\)