Question 182488
let x=amount invested at 13%
then
x+10000=total money invested

(0.10)10000+0.13x=0.11(x+10000)
1000+0.13x=0.11x+1100
0.13x=0.11x+100
0.02x=100
2x=10000
x=$5000

To get an average 11% return, Helen must invest $5000 at 13%

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