Originally posted by knptmug at 2005-4-20 09:47 PM:' J9 m. W! M4 _- {6 \0 B8 I! ~
set small watermelon: x, middle watermelon y and big watermeton z ( v* x. G* P+ X8 t, x8 E - i* }& ]) ~5 N+ D/ @# \3 Ctwo simultaneous equations are set up:+ w l# ^) v8 \" G3 H( U
0.5x+2y+5z=50 (1)8 V& G- z4 p0 q* I$ ?. f
x+y+z=50 (2)' \ }3 q/ c0 e9 V
Equation(1) means that the total amount paid is equal t ...