The answer depends on the notebooks: they come in different sizes. So either you have to measure the mass of the five of them together or IF they are all identical, then measure the mass of one and multiply by 5.
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Its Weighs 2.5 Pounds If U Have A Ruler It'll Show it
one kilogram or kg
probably a meter!
80 - 75 = 5 grams.
It depends on the spiral - there are lots of different ones, with different formulae.