Word Problem... Question below. It was to long

Question

A women invested $20,000 in two accounts, one paying 7% annual interest and the other paying 8%. Her annual interest income from these two accounts was $1550. How much did she have at 7%?

Answer 1

x = investment at 7%

20000 - x = investment at 8%

 

0.07x + 0.08(20000 - x) = 1550

0.07x + 1600 - 0.08x = 1550

-0.01x = -50

x = 5000

 

She invested $5,000 at 7%.