Originally posted by knptmug at 2005-4-20 09:47 PM: 8 A3 ~4 Z- a) Z) V1 Vset small watermelon: x, middle watermelon y and big watermeton z 5 G8 }. y P# U. v6 `. `+ _! l% f" X
two simultaneous equations are set up: ' u' h; [1 e7 ~6 \# W0.5x+2y+5z=50 (1) r+ u; {0 Z T6 k' r; T2 o
x+y+z=50 (2), W- a5 I) f, S8 i
Equation(1) means that the total amount paid is equal t ...