Originally posted by knptmug at 2005-4-20 09:47 PM:* ]) j$ k$ n0 j( r# D
set small watermelon: x, middle watermelon y and big watermeton z ! M5 O/ i8 E. Q0 ^5 u4 R( y5 {# _1 |
two simultaneous equations are set up:" [8 ^# F; J) X+ q5 q P1 X
0.5x+2y+5z=50 (1) & p3 a- |; A/ g+ Y. V2 b; Tx+y+z=50 (2)! Z4 v' T/ r1 y# t' K0 b4 d5 W; m
Equation(1) means that the total amount paid is equal t ...