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lebar slide. : 4m
lebar bayangan slide:6m
panjang bayangan slide:x
5/4=x/6
5.6=4.x
30=4x
x=40/3
x=7,5
lebar bayangan slide = p x l
=7,5m x 6m
=45m2
10) 6/15 = 4/X
6X = 15x4
6X = 60
X = 60/6
X=10 kg