Originally posted by knptmug at 2005-4-20 09:47 PM:: r2 q$ [! @, c _/ Y7 g
set small watermelon: x, middle watermelon y and big watermeton z % D+ C& a7 y! f5 o8 j. P# x0 s y% i; R0 V9 k
two simultaneous equations are set up:2 ~+ v, s. O7 k
0.5x+2y+5z=50 (1) $ z% }; i3 B0 v! g2 dx+y+z=50 (2)& d4 s2 V( Q9 Q; P' Y$ Y
Equation(1) means that the total amount paid is equal t ...