Dithopha tse pedi di phadisana mo lobelong lwa mitha di le 4 x 400; lobelo lo mo go lone setlhopha se sengwe le se sengwe se nang le maloko a le mane a a tabogang dimitara di le 400, kgotsa potololo e le nngwe, mo lebaleng la maemo a a tlwaelegileng. Selo sa ntlha sa dithopha tse pedi se na le bokgoni jo bo lekaneng mme leloko lengwe le lengwe le tla taboga karolo ya lona ya dimitara di le 400 ka metsotswana e le 55 ka tlhomamo. Setlhopha sa bobedi ga se na bokgoni jo bo lekaneng; motabogi wa bone wa ntlha o tla taboga karolo ya gagwe ya dimitara di le 400 ka metsotswana e le 60 mme morago ga foo motabogi mongwe le mongwe o tla nna bonako ka metsotswana e le 3 go feta yo o mo tlhakanetseng. Fa o dirisa tshedimosetso e, setlhopha se se bonako se tla fenya ka metsotswana e le mekae? 

Jean is two years older than Mark.  Two years ago Mark was 5 years older than half Jan's age.  If Jan is 30 how old is Jean?
Setlhopha sa ntlha se tla fetsa lobelo ka metsotswana e le 4*55 = <<4*55=220>>220.
Mo setlhopheng sa bobedi re tshwanetse go bona gore motabogi mongwe le mongwe o taboga ka bonako jo bo kana kang. Re a itse gore motabogi wa ntlha o tla fetsa karolo ya gagwe ka metsotswana e le 60, ka jalo wa bobedi o tla tsaya metsotswana e le 60 - 3 = 57, mme morago ga foo wa boraro o tla tsaya metsotswana e le 57 - 3 = 54, mme wa bone o tla tsaya metsotswana e le 54 - 3 = 51.
Ka jalo, setlhopha sa bobedi se tla fetsa lobelo ka metsotswana e le 60 + 57 + 54 + 51 = <<60+57+54+51=222>>222.
Jalo he, setlhopha sa ntlha se tla fetsa ka bonako ka metsotswana e le 222 - 220 = <<222-220=2>>2 go feta setlhopha sa bobedi.
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2 years ago Jan was 30-2=<<30-2=28>>28 years old
So Marks age two years ago was 5+28/2=<<5+28/2=19>>19 years old
Mark is now 19+2=<<19+2=21>>21 years old
So Jean is 21+2=<<21+2=23>>23 years old
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