Originally posted by knptmug at 2005-4-20 09:47 PM:" o+ O" E% @6 w/ U0 D4 |3 u% m
set small watermelon: x, middle watermelon y and big watermeton z w6 {; a/ |- e' S4 t# s 9 }) T) h0 q6 k, W& \two simultaneous equations are set up:3 c, N$ T+ d' k$ A. l" W
0.5x+2y+5z=50 (1)- ^' g) d% K4 @4 t/ p. B
x+y+z=50 (2) 3 y; W$ [- ?6 GEquation(1) means that the total amount paid is equal t ...