Our parents always nag us to put uneaten food in the refrigerator during the sum

Question

Our parents always nag us to put uneaten food in the refrigerator during the summer because it would quickly go bad if left out on the kitchen counter top. As a consequence, a lot of good food usually ends up in the garbage. If your lunch spoils in five days when left out during the winter, when the average indoor temperature is 20 degree C. how long will it take for your lunch to spoil if left out during the summer when the average indoor temperature is 30 degree C? (Experiments have shown that food spoils 40 times faster at 25 degree C than it does when refrigerated at 4 degree C.]

Explanation / Answer

Given that food spoils in 5 days when left out in winter,

so when left out in summer food spoils 40 times faster

i.e 5 * 0.4 = 2days

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