Question 993952
Call the amount invested at 4%, x.  Thus the amount invested at 5% is 700-x.
Then the setup looks like this:

(.04)x + (.05)(700-x) = 30
Multiply by 100
4x + 5(700-x) = 3000
4x + 3500 - 5x = 3000
-x = -500  and
x = $500 invested at 4%
Thus $200 is invested at 5%.