tolong bantu jawab ya no 21 pakai cara

jawab

banyak ubin = luas aula / luas ubin

n = (21 m x 15 m )/ (30 cm x 30 cm)

n = (2.100 cm x 1.500 cm / (30 cm x 30 cm)

n = 70 x 50

n = 3.500