Originally posted by knptmug at 2005-4-20 09:47 PM: 8 w4 e: Z8 D& {7 z a) N: i3 F% lset small watermelon: x, middle watermelon y and big watermeton z: h' x: x' d) R
5 p; Q* C6 b7 T" z+ W, ]
two simultaneous equations are set up:4 j5 x( z$ w2 X# M7 L2 P
0.5x+2y+5z=50 (1)* h& n6 A1 l0 t; j; h% I1 Z
x+y+z=50 (2) ' Z! ~$ p# k( I. ]: N1 ]Equation(1) means that the total amount paid is equal t ...