Originally posted by knptmug at 2005-4-20 09:47 PM:: v& k6 k' t1 {0 f V4 v" C
set small watermelon: x, middle watermelon y and big watermeton z : r" C/ ]- }$ v v) P& n. Q$ i4 D: N* _4 f, c
two simultaneous equations are set up: 2 d+ b1 S2 U0 {1 _+ s0.5x+2y+5z=50 (1). {9 V5 P9 X8 L# E% F3 i( ]
x+y+z=50 (2) % F# F* n5 U! N7 h$ o# W/ @Equation(1) means that the total amount paid is equal t ...