Question 1160356
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Let x be invested in a real estate;

then 2x is invested in large cap stock

and the rest, (8000-x-2x) = 8000-3x is invested at bond fund.


The total return equation is

    0.069x - 0.125*2x + 0.049(8000-3x)  = 191


Simplify; express x and calculate


    x = {{{(191-0.049*8000)/(0.069-0.125*2 - 0.049*3)}}} = 612.80


<U>ANSWER</U>.  612.80 invested in large cap stock;  2*612.80 = 1225.60 invested in real estate and the rest, 
         8000-612.80-1225.60 = 6161.60 invested in bonds.


<U>CHECK</U>.   0.069*612.80 - 0.125*1225.60 + 0.049*6161.60 = 191.00  is the total return.   ! Precisely correct !
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Solved.


Notice a remarkable fact:  the problem solved using one single equation in one single unknown (!)


It is the major lesson to learn from my solution (!)