## Answer

### Start

Let's label the balls 1,2,3,4,5,6,7,8

Put balls 7 and 8 away. Weigh balls 1,2,3 against 4,5,6.

### Case 1

The scales match. Balls 1,2,3 weigh the same as balls 4,5,6

Clearly none of 1,2,3,4,5,6 are the heavier ball.

Weigh 7 against 8 to find the heavier ball in 2 turns.

### Case 2

The scales do not match. Suppose 1,2,3 are heavier than 4,5,6.

Take any 2 balls from 1,2,3 and weigh them.

It should be clear which is heavier, again using 2 turns.

### The Answer

CLearly, we can find the heavier ball in 2 turns.

But what about if one ball was heavier OR lighter. What then ?

Take a look at some of the other variations on this theme to see why you might not
see the wood for the trees.