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= 40 + 75
= 115
jadi tumpukan 16 ember adalah 115 cm
b) a + (n-1 ) b = 95 cm
40 + 5n - 5 = 95
5n = 95 - 35
5n = 60
n = 12
b =45-50=5cm
u16 = a + 15b = 40+75 = 115cm
b. a + nb = 95
40 + 5n = 95
5n = 95 - 40
5n = 55
n = 11 ( karena n+1) maka :
banyak ember ditumpuk = 12