# JEE-Mains 2015 (27/30)

Geometry Level 2

If the angles of elevation of the top of a tower from three collinear points $$A, B,$$ and $$C$$, on a line leading to the foot of the tower, are $$30^{\circ},45^{\circ},$$ and $$60^{\circ},$$ respectively, then the ratio $$AB:BC$$ is $$\text{__________}.$$

×