59. The sum of two angles of a triangle is half of a right angle, and one of these two angles is $5^{\circ}$ less than the other. The degree measure of the smallest angle in the triangle is $\qquad$ $\circ$.

A triangle has two interior angles whose sum is half of a right angle, and one of these angles is $5^{\circ}$ less than the other. The degree measure of the smallest angle in the triangle is $\qquad$ .