Originally posted by knptmug at 2005-4-20 09:47 PM:* s" d- o% a6 ?4 V* M3 ^
set small watermelon: x, middle watermelon y and big watermeton z 7 D( m0 F' p7 {- {. [9 s 6 \* E8 b, Q7 S) ~. otwo simultaneous equations are set up: # j( ^+ R& P7 S' s( d0.5x+2y+5z=50 (1)& M. \+ V8 J8 |- E# e4 F p6 [
x+y+z=50 (2)" F- R- o) H; h D0 t. _
Equation(1) means that the total amount paid is equal t ...