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Cucu = C
Kakek= K
5( C -3) = K-3
5c - 15 = K-3
5C - K = 12
K + C = 78
K = 78 - C
5C - K = 12
5C - ( 78 -C) = 12
5C -78 +C = 12
6C = 12 + 78
6C = 90
C =90/6 = 15 tahun (sekarang)
2 tahun lagi Cucu = 15 + 2 = 17 tahun