Originally posted by knptmug at 2005-4-20 09:47 PM: # R8 {. @$ Y& A1 d9 j& Wset small watermelon: x, middle watermelon y and big watermeton z 0 F, R. X0 L" g$ l; Z) P, ^ 6 ]* v2 A t* ^ X* Y+ xtwo simultaneous equations are set up: 8 k+ w; A: E! Y- t5 l0.5x+2y+5z=50 (1) 5 U" P4 M6 D* t6 @+ j0 q* Ix+y+z=50 (2) ; Z& v0 R+ E- Z2 e1 W& pEquation(1) means that the total amount paid is equal t ...