$$0.08a=3-0.1a$$
$a = \frac{50}{3} = 16\frac{2}{3} \approx 16.666666667$
$$0.08a+0.1a=3$$
$$0.18a=3$$
$$a=\frac{3}{0.18}$$
$$a=\frac{300}{18}$$
$$a=\frac{50}{3}$$
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