Question 221206
Let  x = amt  at  14%  and  y =  amt  at  16%
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.14x +.16y = $ 3000
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but,,,x+y=$ 25,000,,,,,,,or y=25,000 -x,,,,,subst
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.14x + .16(25,000-x) = 3000
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.14x + 4,000 - .16x = 3000
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- .02 x = -1000
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x= $ 50,000,,,,,y= - $ 25,000
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Checking,,, 50000(.14) - 25000(.16) = 7000 - 4000 = 3000,,,math  correct  BUT
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To  make  $ 3000 from  $ 25,000,, need  return  of  3000/25000= .12 or  12 % ,,,only 
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The  real  question  is  how much  at  14 % = $ 30,000
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.14 * x = $3000,,,,x= 3000/ .14 = $ 21,428.57
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If  we  invested  all  at  16%,  we  would  invest,,,y= 3000/.16 = $ 18,750
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