halaman sekolah panjang 84 m , lebar 45 m, akan dipasang paping berukuran 35 cm dikali 20 cm ,berapa paping yg dibutuhkan

Panjang halaman = p = 84 m = 8.400 cm
Lebar halaman = l = 45 m = 4.500 cm
Luas halaman = p x l = 84 m x 45 m = 3.780 m² = 37.800.000 cm²
Luas paping = 35 cm x 20 cm = 700 cm²

Jumlah paping yg dibutuhkan = Luas halaman / Luas paping
                                                 = 37.800.000 cm² / 700 cm²
                                                 = 54.000