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140 = 7 x L x 5
L = 140 / (7 x 5)
= 140 / 35
= 4 cm
Vbalok = 140 cm³
p=7 cm
t=5 cm
Ditanya: l ?
V = p × l × t
140 = 7 × l × 5
l = 140 ÷ 35 = 4
Sehingga, lebar mainan tersebut adalah 4 cm