題目誤導人~
# @' g9 t" V q/ i0 Jowner 100) \8 t/ H1 X: G! t6 y1 U! M
owner's son 20tvb now,tvbnow,bttvb9 m3 V+ u! n# o- j& g# k* r( b
each pay 40
1 K% `& X0 }6 p+ w4 Wtvb now,tvbnow,bttvb40*3 = 120& k- O) F: b& N% i" A4 X. R: [
120(3 guys) - 20(owner's son) = 100 (owner) |