Solve for n
n=30
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0.31n-0.11n=6
Subtract 0.11n from both sides.
0.2n=6
Combine 0.31n and -0.11n to get 0.2n.
n=\frac{6}{0.2}
Divide both sides by 0.2.
n=\frac{60}{2}
Expand \frac{6}{0.2} by multiplying both numerator and the denominator by 10.
n=30
Divide 60 by 2 to get 30.
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