SOLUTION: Fill in the blanks. Mrs. Brighton invested $30,000 and received a total of $2,300 in interest. She invested part of the money at 10% and the remainder at 5%. She invested $___

SOLUTION: Fill in the blanks. Mrs. Brighton invested $30,000 and received a total of $2,300 in interest. She invested part of the money at 10% and the remainder at 5%. She invested $____

Question 316829: Fill in the blanks.
Mrs. Brighton invested $30,000 and received a total of $2,300 in interest. She invested part of the money at 10% and the remainder at 5%. She invested $_______ at 10% and $_________ at 5%

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount at 10%, B the amount at 5%.
Total amount
1.
Total interest
2.
Multiply eq. 2, by (-10) and add to eq. 1,

Then from eq. 1,

.
.
.
She invested $16,000 at 10% and $14,000 at 5%.
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