Question 1183157
<pre>
             RATE       QUANT.                    INTEREST

Econo        0.03      6000-x-(x+1200)=4800-2x    0.03(4800-2x)
Stanbic      0.05       x                         0.05x
Fidelity     0.06       x+1200                    0.06(x+1200)
TOTAL                   6000                      522
</pre>

{{{highlight_green(0.03(4800-2x)+0.05x+0.06(x+1200)=522)}}}
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Simplifying and solve for x, amount deposited in Stanbic Bank would be 6120 which makes no sense.  No solution in real, positive numbers.