Mary o monnye ka dingwaga di le pedi mo go Joan, yo o mogolo ka dingwaga di le tlhano mo go Jessa. Fa Jessa a na le dingwaga di le 20, a di feletseng tsa dingwaga tsa basetsana bao ba bararo ke bokae?

Johnny took his allowance of $20 and added an extra $10 to it.  He then invested this sum of money, which tripled in a year.  How much money did he have after a year?
Joan o na le dingwaga di le 20 + 5 = <<20+5=25>>25.
Mary o na le dingwaga di le 25 – 2 = <<25-2=23>>23.
Ka jalo, a di feletseng tsa dingwaga tsa bone ke 20 + 25 + 23 = <<20+25+23=68>>68.
#### 68

Johnny invested twenty and ten dollars for a total of 20+10=<<20+10=30>>30 dollars invested
Johnny tripled this amount of money over the year, for a total of 30*=90 dollars
#### 90