Gary o rekile mokoro ka $9000. Mo ngwageng wa ntlha o ne wa fokotsega ka 30%. Ngwaga wa bobedi o ne wa fokotsega gape ka 30%. Ngwaga wa boraro o ne wa fokotsega ka 20%. Mokoro o lo ka bokae morago ga dingwaga di le tharo?

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?
Morago ga ngwaga wa ntlha: 9000(.30) = 2700
9000 - 2700 = <<9000 - 2700 = 6300>>6300
Morago ga ngwaga wa bobedi: 6300(.30) = 1890
6300 - 1890 = <<6300 - 1890 = 4410>>4410
Morago ga ngwaga wa boraro: 4410(.20) = 882
4410 - 882 = <<4410 - 882 = 3528>>3528$
#### 3528 

There are 4*2 = <<4*2=8>>8 yellow blocks in the tower.
There are 32-4-8 = <<32-4-8=20>>20 red blocks in the tower.
#### 20