amc-2014-up-27

A cube is made up of 1 cm \(\times %speech% ,by,\) 1 cm \(\times %speech% ,by,\) 1 cm blocks and measures 12 cm  \(\times %speech% ,by,\) 12 cm  \(\times %speech% ,by,\) 12 cm. 

Sharyn is using the same set of blocks to make a set of stairs.

The picture shows how she started, making a set of stairs 4 blocks high, 4 blocks front to back and 5 blocks wide.

Her finished set of stairs will use all the blocks and be 8 blocks high and 8 blocks from front to back.

How many blocks wide will they be?