Originally posted by knptmug at 2005-4-20 09:47 PM:% u" T4 o+ P! @' t. I7 g, N1 ]! Q
set small watermelon: x, middle watermelon y and big watermeton z: f1 G$ q; M9 k. U
4 S. [4 c$ ]% [* v3 G! w7 ^. X5 _two simultaneous equations are set up: . D! t* w5 S/ A2 f" w/ }0.5x+2y+5z=50 (1) t; l1 w: K" E8 N& rx+y+z=50 (2)" a9 [# u: j. q, D- d( ~% w9 u) @
Equation(1) means that the total amount paid is equal t ...