Originally posted by knptmug at 2005-4-20 09:47 PM: & W' t8 e4 M+ J1 t/ F* tset small watermelon: x, middle watermelon y and big watermeton z : U1 F' A }( n3 I9 W0 T3 F 4 V! P- b Q/ y3 S; m: ?two simultaneous equations are set up: ! a5 B( L1 q6 F# {" w0.5x+2y+5z=50 (1)6 r3 s0 l/ v' x
x+y+z=50 (2)% G5 y- Z; X$ C, l' v
Equation(1) means that the total amount paid is equal t ...