Originally posted by knptmug at 2005-4-20 09:47 PM:( |; K5 i' K; I9 S
set small watermelon: x, middle watermelon y and big watermeton z: l8 P2 w. P+ M: {) Q8 j
: R8 X. ^: o6 q; t* _ E
two simultaneous equations are set up: + ^2 P6 r z1 {7 R# g: b0.5x+2y+5z=50 (1)' `# Y9 n$ o. D5 I1 M n! O; R
x+y+z=50 (2)7 b" F1 g- c* M
Equation(1) means that the total amount paid is equal t ...