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MGSM / Magari yamejipanga kwenye barabara. Baadhi ya magari hayo yanapita katika dakika…

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Magari yamejipanga kwenye barabara. Baadhi ya magari hayo yanapita katika dakika 15 za kwanza za trafiki, kisha magari 20 zaidi yanapita katika dakika 15 zinazosalia za trafiki. Magari 5 kutoka kwenye laini yanaondoka kwenye barabara kuu ili yasiendshwe kwenye trafiki hiyo. Ikiwa awali kulikuwa na magari 30 kwenye barabara, ni magari mangapi yalipita trafiki katika dakika 15 za kwanza?

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