SOLUTION: Someone invested $24,00 at 8% and the rest at 7.2%. How much did they invest at each same rate if their income from 8% is 2/3 that of 7.2%

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Question 110586: Someone invested $24,00 at 8% and the rest at 7.2%. How much did they invest at each same rate if their income from 8% is 2/3 that of 7.2%
Answer by josmiceli(3359) About Me  (Show Source):
You can put this solution on YOUR website!
.08x+=+%282%2F3%29%2A+.072%2824000+-+x%29
.24x+=+.144%2824000+-+x%29
.24x+=+3456+-+.144x
.384x+=+3456
x+=+9000
24000+-+x+
24000+-+9000+=+15000
$9,000 is invested @8% and $15,000 @ 7.2%
check
.08x+=+%282%2F3%29%2A+.072%2824000+-+x%29
.08%2A9000+=+%282%2F3%29.072%2A15000
720+=+%282%2F3%29%2A1080
2160+=+2160
OK