Solve for n
n=10
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0.05n+0.2n-0.4=2.1
Use the distributive property to multiply 0.1 by 2n-4.
0.25n-0.4=2.1
Combine 0.05n and 0.2n to get 0.25n.
0.25n=2.1+0.4
Add 0.4 to both sides.
0.25n=2.5
Add 2.1 and 0.4 to get 2.5.
n=\frac{2.5}{0.25}
Divide both sides by 0.25.
n=\frac{250}{25}
Expand \frac{2.5}{0.25} by multiplying both numerator and the denominator by 100.
n=10
Divide 250 by 25 to get 10.
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