Originally posted by knptmug at 2005-4-20 09:47 PM:; Z" b- W$ r/ h m' Y0 I
set small watermelon: x, middle watermelon y and big watermeton z % }( o. q. p8 f2 ] ' |$ L( |5 E! Ktwo simultaneous equations are set up:) Q5 }) t/ Y8 i2 K6 T
0.5x+2y+5z=50 (1)2 `9 {: Q3 f5 R6 R& [9 G
x+y+z=50 (2)6 ?, z- [- o# Y' i% i
Equation(1) means that the total amount paid is equal t ...