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pajang dlm = a
lebar luar = 18
lebar dalam = 18 - 5- 5
= 8
perbandingan
a/24 = 8/18 (kali silang)
18 x a = 8 x 24
18a = 192 /18
a = 10 12/18
= 10 2/3
sisa karto bawah
sisa = 18 - 10 2/3
= 8 - 2/3
= ( 24- 2)/ 3
= 22/3
= 7 1/3
jawabnnnya A