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Verified answer
Kerangka balok :r = 4(p+l+t)
=4 (x) + 4(x+2)+ 4(x+4)
=4x+4x+8+4x+16
=4x+4x+4x+8+16
=12x+24
a. 12x+24 < 60
b.12x+24 < 60
12x < 60-24
12 x < 36
x< 3