Originally posted by knptmug at 2005-4-20 09:47 PM:$ B) y- j9 J! v( J2 T6 l- w
set small watermelon: x, middle watermelon y and big watermeton z $ \" D' i+ u3 [3 h& A$ ]9 [) J& F0 q
two simultaneous equations are set up: 2 E, B% o ?1 B3 u; h) M4 \6 [0.5x+2y+5z=50 (1) $ I, Y) R! r x5 M' n5 q, [x+y+z=50 (2)4 g3 W) d+ y# q. K
Equation(1) means that the total amount paid is equal t ...