Moagi o bereka dibeke di le 4 mo kgweding mme a bereke malatsi a le 6 mo bekeng. Fa a duelwa $50 ka letsatsi, o tla bo a amogela bokae fa a bereka ngwaga yotlhe?

Alice is 7 years older than Beth, who is 5 years older than Erica. What is the difference between the ages of Alice and Erica, if Erica is 30 years old?
Moagi o bereka malatsi a le 6 mo bekeng mme a bereke dibeke di le 4 mo kgweding, ka jalo o bereka malatsi a le 6/beke * dibeke di le 4/kgwedi = <<6*4=24>>24 malatsi/kgwedi
Fa a amogela $50 ka letsatsi, o tla bo a amogela $50/letsatsi * 24 malatsi/kgwedi = $<<50*24=1200>>1200/kgwedi
Ngwaga e lekana le dikgwedi di le 12, ka jalo ngwaga le ngwaga o amogela $1200/kgwedi * dikgwedi di le 12/ngwaga = $<<1200*12=14400>>14400
#### 14400 

Beth is 30+5 = <<30+5=35>>35 years old.
Alice is 35+7 = <<35+7=42>>42 years old.
The difference between the ages of Alice and Erica is 42-30 = <<42-30=12>>12 years.
#### 12