algebra
posted by mark .
Solve the problem. Helen Weller invested $15,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the total interest is equal to the interest on the two investments at the rate of 13%?

$5500.
Set up the equations like this
(11,000*.12)+(x*.15)=(11,000+x).13
1320+ .15x=1430+ .13x
.02x=110
x= 5500
by Ali :)