Question 96263

Mobil + (Mobil-$24 billion) = $656 billion
x+(x-24)=656
2x-24=656
2x=656+24
2x=689
x=340
.
So,
Mobil = $340 billion
Wal-Mart = x-24=340-24=316
.
Checking:
340+316=656 [checks out]