Maryan waa labo jeer ka weyn tahay Elizabeth. Yooxanaa waa laba sano ka weyn yahay Elizabeth. Da'da John iyo Elizabeth marka la isku daro waa sideed. Mary waa imisa jir? U sharax sababayntaada.
Aynu niraahno da'da Elizabeth waa x. Waxaan ognahay in John uu labo sano ka weyn yahay Elizabeth, da'dooda isku darka ahna ay tahay 8 jir. Marka x + x + 2 waa 8, taasoo la micno ah Elizabeth waa 3. Mary waa labo jeer da'da Elizabeth, taas oo ka dhigaysa Mary 6.