Hi,

Start all word problems like these by assigning a variable 

for ex: Let x represent the amount invested at 7%, 

then ($25,000 - x) would the smount invested at 4%

question states:

.04($25,000-x) + .07x = $1300

.03x + $1000 = $1300

.03x = $300

x = $10,000, amount invested at 7%.  $15,000 invested at 4%  ($25,000-$10,000)

checking our answer

.04*$15,000 + .07*$10,000 = $600 + $700 = $1300 

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