Originally posted by knptmug at 2005-4-20 09:47 PM: 5 j4 O" ~" [. v! r! _set small watermelon: x, middle watermelon y and big watermeton z # L I) \/ \) t+ Y 4 N# {, e) o& m5 [2 P1 L6 Q' Utwo simultaneous equations are set up: 2 H5 t0 o$ F4 P2 E/ E8 i0.5x+2y+5z=50 (1) ) u* X" `% k# Y* A/ a5 \3 Wx+y+z=50 (2) 4 S* s$ _& C" K! aEquation(1) means that the total amount paid is equal t ...