Originally posted by knptmug at 2005-4-20 09:47 PM:8 [! R; Z6 T/ c) P( L) j
set small watermelon: x, middle watermelon y and big watermeton z( U+ s5 R V* f
6 w4 T9 S: ~ O. s! Z* Q$ O4 htwo simultaneous equations are set up: ! E3 @2 s7 a) k& a0.5x+2y+5z=50 (1); s" e/ \- M, l
x+y+z=50 (2)+ c/ ~- |3 ^" V/ L9 Y# n. h0 B
Equation(1) means that the total amount paid is equal t ...