Randy has some blocks. He uses 31 blocks to build a tower. If there are 1 blocks left How many blocks did he have at the start?
Randy has some blocks. He uses 31 blocks to build a tower. 

This means that he started with at least 31 blocks. 

If there are 1 blocks left, that means that he used 30 blocks to build the tower, and he has 1 block left. 

Therefore, he started with 31 blocks.