Mr Brockley answered the maths problem during his lunch break on Friday. Even more impressively, he managed this mental battle despite being the father of a four-month old baby.
Ai hwn yw'r cynllun diweddaraf i atal beichiogi plant yn eu harddegau? "Defnyddiwch gondom neu gewch chi blant a fyddwch chi'n thic a methu mynd i'r brifysgol"!
