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3n-n=8
2n=8
n=8/2=4
2. k=2(p+l)
94=2(5x+2+2x+3)
94=2(7x+5)
94=14x+10
14x=94-10
x=84/14=6
p= 32
l=15
8÷3=2,66
jadi,n adalah 8
2)p=(5x+2)=94cm
5x+2-2=94-2
5x=92
x=18,4
l=2x+3=84
2×+3-3=84-3
2×=81
×=40,5