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أنNE وأخ özellik استخدام 1 غم + 1 غم = 2 جرامات.
ابن آني يستخدم 3 جرامات وأم آني تستخدم 2 جرامات ، لذلك معًا يستخدمون 2 جرام + 3 جرامات + 2 جرامات = 7 جرامات / غسلة
كل يوم ، يستخدم العائلة 7 جرامات / غسل * 3 غسلات / يوم = 21 جرامًا.
باستخدام هذا المقدار يوميًا ، سوف يستمر معجون الأسنان لمدة 105 جرامات / 21 جرام / يوم = 5 أيام.
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