Originally posted by knptmug at 2005-4-20 09:47 PM:6 O- u, [) Y- X$ }+ a# x6 _
set small watermelon: x, middle watermelon y and big watermeton z 1 G5 W+ H3 F4 D. ~; g3 J ! e- V4 x) y5 `" ~1 f# Rtwo simultaneous equations are set up:5 K2 [' A9 B. Q& O! n* A+ N
0.5x+2y+5z=50 (1) : E, R& a% B; o6 T5 |x+y+z=50 (2)! b( k6 [2 E$ S- \ V
Equation(1) means that the total amount paid is equal t ...