زمن شحن البطارية في مكنسة المكنسة اللاسلكية الخاصة بماري يستمر لمدة عشر دقائق. يستغرق منها أربع دقائق لتنظيف كل غرفة في منزها. ماري لديها ثلاث غرف نوم ومطبخ وغرفة معيشة. كم مرة تحتاج ماري إلى شحن مكنستها للتخلص من منزها بأكمله؟
ليس لدي ماري 3 + 1 + 1 = 5 غرف في بيتها.
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