Originally posted by knptmug at 2005-4-20 09:47 PM: g: @3 m2 D7 e( s& G# D
set small watermelon: x, middle watermelon y and big watermeton z& j( z% u5 c; Y6 d/ u6 O9 G
/ @- k% B0 l) X9 W8 r$ X5 t
two simultaneous equations are set up: ; Q& [! i6 P1 e" ^. H; H0.5x+2y+5z=50 (1)) Z @) Z5 h9 n9 ?
x+y+z=50 (2)" z2 }2 e4 R* i# }; q& e) t! o9 g
Equation(1) means that the total amount paid is equal t ...