<human>:  A tower is made out of 4 blue blocks, twice as many yellow blocks, and an unknown number of red blocks. If there are 32 blocks in the tower in total, how many red blocks are there?
<bot>: How many yellow blocks are in the tower? ** There are 4*2 = <<4*2=8>>8 yellow blocks in the tower.
How many red blocks are in the tower? ** There are 32-4-8 = <<32-4-8=20>>20 red blocks in the tower.
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