1)easier to find food
2)easier to build shelter
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Assuming the numbers are meant to be fractions ... 3/5 of bathroom uses 1/3 of bottle, so 1/5 of bathroom uses 1/3 x 1/3 = 1/9 of bottle. Then 5/5 or entire bathroom uses 1/9 x 5 = 5/9
3x3x5-6+2+54+5=100
The pentatonic scale uses 5 tones in an octave.
Trampolines, garages, anything that uses a spring :)
ruler, temperature, tape measure, graduated cylinder, linear measurements