just say i have a cheese sandwhich [meaning inside the bread there is margarine and a slice of cheese] just say wrap 6 sandwiches in the 3 options above^^ and put 3 in the fridge and 3 at room temperaturewhich ones the safest to eat after 2 weeks and why?? how does mould grow on the one with room temperture and covered with plastic wrap??
make a boat that displaces more water (weight) than the 300 gram you're trying to float find how much does 500 grams of water weigh500 grams is used so that you have 200 grams extra, for the boat and minor leaks your boat may have then use a simple designthe hot glue and sticks is edued ot make a basic frameif you don't make one, the boat will be flimsy and likely to sinkto find how big the frame is, get the 500 grams of water, find its volume, and figure out the size of the box to hold 500 grams of waterUse this box to build the framethen glue foil around the frame with more hot gluehot glue is water proof and glues welltest your design every step of the way, for leaks in a tub of water when you're done, you have a ugly boxy boat that holds at least 300 grams of material since it displaces 500 (or more) grams of water if you're good with buildign things, you can figure out how to build your boat more boaty than a square box of foilIt'll still work, but it'll take much mor effort.
foil can keep the sandwich in good condition keeping it firmly wrapped and protectedbut could lose moisture faster than cling film it will last longer in the fridge at lower colder tempratures as bacteria will breed faster at room temperature the cheese will get sweaty and start to mold faster inside cling film but two weeks in the fridge or the room is too long you could try freezing it for two weeks but the cheese will lose its consistencygreas proof paper will get soggy in the fridge and the bread will get stail sooner out so is best used for baking cakes
