If a = (\( \frac{3}{7} \))b, then the value of \(\frac{8a-b}{2a+3b}\) is:
17
\( \frac{21}{17} \)
\( \frac{17}{2} \)
\( \frac{17}{27} \)
A vendor bought toffees at 10 for a rupee. How many for a rupee must he sell to gain 25%?
Two ships are sailing in the sea on the two sides of a lighthouse. The angles of elevation of the top of the lighthouse as observed from the ships are 45° and 60° respectively. If the lighthouse is 81 m high, then the distance between two ships is:
\(\frac{1+\sqrt{3}}{81\sqrt{3}}\) m
\(\frac{1+\sqrt{3}}{\sqrt{3}}\) m
\(\frac{81(1+\sqrt{3})}{\sqrt{3}}\) m
\(\frac{81}{\sqrt{3}}\) m