Originally posted by knptmug at 2005-4-20 09:47 PM:+ E! z+ z$ t: I. z- a
set small watermelon: x, middle watermelon y and big watermeton z/ I7 d1 p( g9 `" H/ k
6 W0 X9 ?# Z; M, R3 E5 B d: Ntwo simultaneous equations are set up:" p& ?% v4 I! V O4 I1 ^
0.5x+2y+5z=50 (1) 1 Z) k( w: l# z4 @8 ?. [% J4 Hx+y+z=50 (2)$ v4 Z2 J4 D& r; q8 t
Equation(1) means that the total amount paid is equal t ...