Tuesday 31 January 2017

Problem 31

A two-digit integer n has the property that the sum of n and its digits is equal to 63. Find n.

Saturday 28 January 2017

Problem 28

Let ABC an isoceles triangle with AB = AC = x, BC = y. Let denote M the midpoint of AB. Find the length of CM.

Friday 27 January 2017

Thursday 26 January 2017

Wednesday 25 January 2017