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maya = 4/3 × 21= 4 × 7 = 28
aldo = 7/3 × 21= 7 × 7 = 49
jumlah semua klereng = 28 + 49 = 77
selisih adalah 21, selisih perbandingan terkecil adalah 7-4 =3
lalu 21/3 = 7
umur maya 7x 4= 28
umur aldo 7x 7 = 49
jadi jumlahnya 28 + 49= 77