Originally posted by knptmug at 2005-4-20 09:47 PM: + D' @% K; Y; ]set small watermelon: x, middle watermelon y and big watermeton z* l( K* ^, x3 S& ?: L
6 z7 l8 P: m+ ]% q0 A* R. ~2 ytwo simultaneous equations are set up: ' {6 l$ [& Q8 v5 d) l& J' t0.5x+2y+5z=50 (1)" X8 q$ N) ]$ x r+ ]* }
x+y+z=50 (2) # V3 I* A3 o* Q5 v9 N9 LEquation(1) means that the total amount paid is equal t ...