Question 9290
Ok We will call the bonds X and the CD's Y

We know that X + Y = 20,000

we also know that X = Y + 3,000

so lets solve the equation:

Y + 3000 + Y = 20,000

Combine terms:

2*Y+3,000=20,000

Subtract 3000 from both sides results: 2*Y=17000

Divide both sides by 2 results: Y = 8,500

so if Y = 8,500, we know X = Y + 3000, so X = 8500 + 3000 = 11,500

So bonds  = 11,500

And CDs = 8,500

For a total of 20,000