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lebar = 3/16 x 64 = 12 cm
luas = p x l = 20 x 12 = 240 cm²(A)
(kalau masih bingung silahkan tanya)
64 = 2 . (5x + 3x)
= 2 . 8x
= 16x
x = 64/16
x = 4
panjang = 5x = 5 . 4 = 20
lebar = 3x = 3 . 4 = 12
L = p . l
= 20 . 12
= 240 cm²
JADI JAWABANNYA a. 240 cm²