Yayasan menyumbang 144 buku 4 sekolah. banyak buku yg diterima berbeda beda. selisih buku yg diterima sekolah A dan B = 16. sekolah B dan C = 12. sekolah C dan D = 8. sekolah A menerima buku yg paling sedikit di banding yang lain. jika buju yg diterima sekolah D = 2A. tent. banyak buku yg diterima masing2 sekolah?
IvanaA
B - A = 16 B = 16 + A C - D= 8.....C = D +8 D = 2A
A + B + C + D = 144 A +(16+A)+C + 2A = 144 4A + C = 144 - 16 4A + c = 128 4A + D + 8 = 128 4A + 2A = 128-8 6A = 120 A = 20 B = 16 + 20 = 36 C = 12 + 36 = 48 D = 2A = 40
B = 16 + A
C - D= 8.....C = D +8
D = 2A
A + B + C + D = 144
A +(16+A)+C + 2A = 144
4A + C = 144 - 16
4A + c = 128
4A + D + 8 = 128
4A + 2A = 128-8
6A = 120
A = 20
B = 16 + 20 = 36
C = 12 + 36 = 48
D = 2A = 40