Question 8598
Let x = amount invested at 5%
3x= amount invested at 6%


Total interest = 
.05x + .06(3x) = 1150
.05x + .18x = 1150
.23x = 1150


Divide both sides by .23
{{{x = 1150/.23}}}
x= $5000 at 5%
3x = $15000 at 6%


Check:  $.05(5000) + $.06(15000) = $1150


R^2 at SCC