Originally posted by knptmug at 2005-4-20 09:47 PM:8 P( W# \, K. \5 ^- j7 K H' o. o
set small watermelon: x, middle watermelon y and big watermeton z 6 j0 q$ \# J1 q * W' t+ Z* _& D" Y" q0 C! D2 u1 Jtwo simultaneous equations are set up:) c$ {1 I2 o; M# y" I' C0 P
0.5x+2y+5z=50 (1)' L* e+ E) y1 X: q, I. F4 z
x+y+z=50 (2)' V# b5 B( l' T' A
Equation(1) means that the total amount paid is equal t ...