Originally posted by knptmug at 2005-4-20 09:47 PM: , R1 `# u- F; ^& J2 e- `set small watermelon: x, middle watermelon y and big watermeton z ' b& J6 F* W' R' }7 E 5 `6 |! b$ O! @, `6 X2 htwo simultaneous equations are set up:2 P5 b- A, r n
0.5x+2y+5z=50 (1) 9 ?/ p5 W. S) O% h3 l9 j3 ax+y+z=50 (2)! y& |2 z* x3 {2 p1 b: u& P: _
Equation(1) means that the total amount paid is equal t ...