Question
My mother divided an apple into 4 equal parts .she gave me two parts and my brother one part. how much apple did she give to both of us together?
any shorter solutions for the question 12
The circle X^2 y^2 4x-7y 12=0 cuts an intercept on y axis of length
If a,b and c are three vectors such that each one is perpendicular to the vector obtained by sum of the other two and |a|=3, |b|=4 and |c|=5, then prove that |a+b+c|=5