A cube is made up of 1 cm x 1 cm x 1 cm blocks and measures 12 cm x 12 cm x 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 from front to back and 5 blocks wide

Her finished set of stairs will use all the blocks and be 8 clocks high and 8 blocks from front to back. How many clocks wide will they be ?