The second stack has 7 blocks + 3 blocks = <<7+3=10>>10 blocks.
The third stack has 10 blocks - 6 blocks = <<10-6=4>>4 blocks.
The fourth stack has 4 blocks + 10 blocks = <<4+10=14>>14 blocks.
The fifth stack has 10 blocks x 2 = <<10*2=20>>20 blocks.
In total there are 7 blocks + 10 blocks + 4 blocks + 14 blocks + 20 blocks = <<7+10+4+14+20=55>>55 blocks.
#### 55