題目誤導人~tvb now,tvbnow,bttvb* S) E: h& a, I, z& ]
owner 100! ^- M5 {4 R' I! d
owner's son 20: X6 n( C( X. q# e7 n: j2 l
each pay 40
& s4 y2 L9 O) e- W8 K; w& xtvb now,tvbnow,bttvb40*3 = 120tvb now,tvbnow,bttvb% {7 u' \, B, z( \
120(3 guys) - 20(owner's son) = 100 (owner) |