Jawabanmu

2014-09-12T20:42:45+07:00
5x + 5y = 1000
5x + 20y = 1760
_____________ -
15y = 760
y = 15.66

20x + 20y = 4000
5x + 20y = 1760
_____________ -
15x = 2240
x = 149.33