Question 1195115
.
<pre>

If x is the distance from the boat to the lighthouse (measured horizontally at the sea level), then

    tan(6°) = {{{20/x}}},


which gives  x = {{{20/tan(6^o)}}} = {{{20/0.1051}}} = 190.3 meters.    <U>ANSWER</U>
</pre>

Solved.