Steps:
1. John buys 3 bags of chips for , then ratio is
2. Now to buy 5 bags of chips, then the price be , then ratio is
3. Now by comparing Equations 1 and 2, then
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4. As we know change the proportion into a fraction, then
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5. Now by doing cross multiplication, we have
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6. The answer is
Hence the price of 5 bags of chips is .