Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
Solve[{0.25*100 == 0.2 x + 0.5 y, 0.75*100 == 0.8 x + 0.5 y}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random