Originally posted by knptmug at 2005-4-20 09:47 PM: & S3 b" r- @! `* m4 G! l4 z4 Rset small watermelon: x, middle watermelon y and big watermeton z( {5 B! l, k/ A1 u
$ {8 G. ^6 @0 F. f+ x- o1 w* _
two simultaneous equations are set up: ! q; @& U4 u' f& l' J2 G0.5x+2y+5z=50 (1) p3 d# N1 e+ V/ t$ N: f1 yx+y+z=50 (2)4 w4 V( z% p9 P, V: d7 T6 l
Equation(1) means that the total amount paid is equal t ...