To float in olive oil the box needs to displace a volume of olive oil that has the same mass as the box - the less dense the oil (for example by being warmer) the more volume the box will need to displace to equal its mass. If it cannot displace a volume of olive oil that equals its mass, the box will sink.
Or to put it another way, the box will float in olive oil as long as its density is less than that of the oil.
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30 grams
12 ounces = about 340.2 grams.
400
box with matches = 45 grams box empty = 12 grams so just matches = box with matches - empty box = 45-12 = 33 grams 33 grams = 220 matches 33/220= each match weighs 0.15 grams
It would actually weigh about 500 grams and it would not be very practical if your cereal box weighed more than you