Boemafofane bo na le difofane di le pedi fela tse di fofang makgetlho a le mantsi ka letsatsi. Letsatsi le lengwe le le lengwe, sefofane sa ntlha se ya kwa Greece ka boraro-borarong (3/4) ya difofane tsa sone, mme difofane tse di setseng di aroganngwa ka go lekana magareng ga difofane tse di yang kwa France le tse di yang kwa Germany. Sefofane se sengwe se fofa fela kwa Poland, mme maeto a sone a le 44 a lekalekana le sephatlo sa palo ya maeto a a dirwang ke sefofane sa ntlha letsatsi le lengwe le le lengwe. Ke difofane di le kae tse di yang kwa France tse di tsayang ke sefofane sa ntlha ka letsatsi le le lengwe?

Comet Halley orbits the sun every 75 years. Bill's dad saw the Comet when he was 30 years old. Bill saw the comet a second time when he was three times the age his father was when he saw the Comet. How old was Bill when he saw the Comet for the first time?
Sefofane sa bobedi se fofa sephatlo sa difofane tsa sa ntlha, ka jalo sefofane sa ntlha se fofa maeto a le 44 * 2 = <<44*2=88>>88 ka letsatsi.
Fa 3/4 ya difofane tsa sefofane sa ntlha di ya kwa Greece, go raya gore difofane tse di yang kwa France kgotsa Germany ke 1 – 3/4 = 1/4 ya palogotlhe ya difofane tsa letsatsi.
Ka jalo he, difofane tsa letsatsi di le 88 / 4 = <<88/4=22>>22 di ya kwa France kgotsa Germany.
Go aroganya difofane tseno ka go lekana go raya gore sefofane sa ntlha se fofa maeto a le 22 / 2 = <<22/2=11>>11 kwa France ka letsatsi le le lengwe.
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Bill saw the Comet for the second time when he was 30 years * 3= <<30*3=90>>90 years old.
Comet Halley can be seen every 75 years, so Bill saw the comet for the first time when he was 90 years - 75 years = <<90-75=15>>15 years old.
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