If one of the equal angles of an isosceles triangle is 65°, then the angle at the vertex is

G is the centroid of a triangle ABC, and the median is AD, the ratio of AD and GA is

The ratio of circumradius and hypotenuse a right-angled triangle is

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to

If 12x – 15 y =9x + 5y, the value of $$ {x^{2}+{y^{2}}\over{x^{2}-y^{2}}}$$ is

The value of $$ {\sqrt{x^{2}y}\over{\sqrt{xy^{2}}}}×\sqrt{y\over{x}}$$ is

If a + b + c=15, abc=120 and (ab+bc+ca)=74, then the value of a³+b³+c³=?

If 0.5x + 0.7y=0.5 and 0.7x + 0.5y=0.7,then the value of x+y is