Question 1121637
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Let x be the unknown value of equal amounts invested at 2%, 7% and 9%.


Then your equation is


    0.02x + 0.07x + 0.09x = 720 dollars,   or


    0.18x = 720,


    x = {{{720/0.18}}} = 4000 dollars.


<U>Answer</U>.  The value of each of the three equal amounts is $4000.


<U>Check</U>.   0.02*4000 + 0.07*4000 + 0.09*4000 = 720 dollars.   ! Correct !
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Solved.