Billy o ithaopela go thusa batho go dira dikgotla tsa bone tsa lekgetho. O kgona go thusa batho ba le 2 ka oura mo diureng di le 3 ka letsatsi. Fa a ikhutsa 20% ya malatsi a magareng ga Mopitlwe wa bo 1 le Moranang wa bo 19, mme a thusa batho mo malatsing a mangwe otlhe. O thusa batho ba le kae? (Gakologelwa gore Mopitlwe o na le malatsi a le 31.)

Ellen decided to play a prank on her friend. She got a case of 12 sodas and shook 3 of them up. Then she took 1 unshaken soda for herself and left. Ellen's brother stopped by and took 1 of the shaken sodas and 2 of the unshaken sodas, then Ellen's friend came along. What is the likelihood, expressed as a percentage, that Ellen's friend gets sprayed with soda from a shaken can?
Sa ntlha, bona palo ya malatsi a magareng ga Mopitlwe wa bo 1 le Moranang wa bo 19: Malatsi a le 31 + malatsi a le 19 = <<31+19=50>>malatsi a le 50
Morago ga foo, tlosa peresente ya nako e Billy a e ikhutseditseng go tswa go 100% go bona peresente ya nako e a e berekang: 100% - 20% = 80%
Morago ga foo, atisa palo eo ka 80% go bona palo ya malatsi a a berekang: Malatsi a le 50 * 80% = <<50*80*.01=40>>malatsi a le 40
Morago ga foo, bona gore Billy o kgona go thusa batho ba le kae ka letsatsi: Batho ba le 2/oura * diura di le 3/letsatsi = <<2*3=6>>batho ba le 6/letsatsi
Morago ga foo, atisa palo ya batho ba a ba thusang ka letsatsi ka palo ya malatsi a a berekang go bona palo yotlhe ya batho ba a ba thusang: Batho ba le 6/letsatsi * malatsi a le 40 = <<6*40=240>>batho ba le 240
#### 240 

First figure out how many unshaken sodas were in the case when Ellen left the room: 12 total sodas - 3 shaken sodas - 1 taken soda = <<12-3-1=8>>8 unshaken sodas.
Next, figure out how many unshaken sodas were left after Ellen's brother came: 8 - 2 = <<8-2=6>>6 unshaken sodas.
Then figure out how many shaken sodas were left after Ellen's brother came: 3 - 1 = <<3-1=2>>2 shaken sodas.
Now add the number of shaken and unshaken sodas to find the total number of sodas left when Ellen's friend came along: 2 + 6 = <<2+6=8>>8 sodas
Now divide the number of shaken sodas by the total number of sodas to find the decimal probability Ellen's friend gets sprayed: 2/8 = <<2/8=0.25>>0.25
Now multiply the decimal probability by 100 to express it as a percentage: .25 * 100 = <<.25*100=25>>25%
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