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Kelas 7 MatematikaBab Perbandingan dan Aritmatika Sosial
Marcel = m
Nando = n
Leo = n
m = 3/4 n
m : n = 3 : 4
n = 3/5 l
n : l = 3 : 5
m : n = 3 : 4 = 9 : 12
n : l = 3 : 5 = 12 : 20
m : n : l = 9 : 12 : 20
a] Kelereng Marcel
= 9/(12 - 9) . 15
= (9/3) . 15
= 45 butir
Kelereng Nando
= 12/(12 - 9) . 15
= (12/3) . 15
= 60 butir
Kelereng Leo
= 20/(12 - 9) . 15
= (20/3) . 15
= 100 butir
b] Jumlah kelereng
= 45 + 60 + 100
= 205 butir