كانت كاثرين لديها عددًا متساويًا من الأقلام والأقلام. إذا كانت لديها 60 قلمًا وأعطت ثمانية أقلام وست أقلام لكل من أصدقائها السبعة pond وأقلام, ثم الاحتفظت بالباقي لنفسها، كم عدد الأقلام وقلم Books التي ظلت عندها؟
قدمت كاثرين 8 أقلام لكلًا من أصدقائها السبعة، مجموعهم 8*7 = 56 قلمًا.
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