A History Student, a Physics Student and a Maths Student shared a flat.
One day the History Student's bin caught fire! Quickly he poured water on the fire, causing s mess but putting out the fire.
Next day the Physics Student's bin caught fire! Grabbing a pen and paper he worked out the exact amount of water needed to put the fire out, then put it out.
On the third day the Maths Student's bin caught fire! Grabbing a pen and paper he worked out the exact amount of water needed to put the fire out, then confident the problem had been solved went to bed.
Challenger