Originally posted by knptmug at 2005-4-20 09:47 PM: # d, p9 w1 E4 _, z! [5 x/ fset small watermelon: x, middle watermelon y and big watermeton z * y- n4 x( p9 ?8 H6 N; U7 _ |; j/ a1 j* J5 A7 G. b% ltwo simultaneous equations are set up:2 L" f; `8 Q$ v" f6 I
0.5x+2y+5z=50 (1)4 r4 s- Y/ [/ q3 @* X4 |4 J
x+y+z=50 (2): F4 b& j+ P$ z" P+ _6 G8 z* b
Equation(1) means that the total amount paid is equal t ...