The sum of the digits of a number consisting of three digits is 20. The middle digit is equal to 1/4th sum of the other two. If the order of the digits be reversed, the number is increased by 198. Find the original number.
In a parallelogram ABCD E and F are two points on the sides DC and BC prove that ar(AFE)=ar(ABE)
Show that any positive integer is of the form 3q, 3q+1 or 3q+2 where q is some integer.