Pay attention to the comma in that sentence. Those are two separate clauses. So there are two statements there:
The money in savings (s) is twice the money in CDs (c).
z is the amount in bonds.
Pay attention to the comma in that sentence. Those are two separate clauses. So there are two statements there:
The money in savings (s) is twice the money in CDs (c).
z is the amount in bonds.