since Andy used 1/6 for half a wall, he would need 1/6 + 1/6 for the whole wall.
1/6 + 1/6 = 1/3. So, Andy need 1/3 of the can for the whole wall.
1/6 = 1/2 of the wall
2/6 = 2/2 = 1 whole wall
2/6 = 1/3 (transforming it into simplest form)
Therefore, 1/3 of the can of paint can he used to paint the whole wall.
Hope this helps.
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