Please help me to understand the solution :( (I have made the sketch, is it correct?, where has the 1/4 comes from? is it like 1:3 (1 ratio 3) => numerator divided by numerator + denominator = 1/1+3 =1/4 (as given on page 6 at http://www.lowndes.k12.ga.us/view/14167.pdf [Broken] )? or am I wrong? For point position vector b in the solution the point B is on the left side from P (as A is on the right side of P)?) Thanks in advance.