ماري أن تنفق سبع مرات sunday الك فترة الزمن في عمل المحاسبة مقارنة بإجراء المكالمات مع العملاء. إذا عملت اليوم لمدة 560 دقيقة، فكم دقيقة قضت في إجراء مكالمات مع العملاء؟
دعونا نكون a هي مقدار الوقت الذي تقضيه ماريان في حسابات وقد يكون c هو مقدار الوقت الذي تقضيه في مكالمات العملاء: نحن نعرف أن a + c = 560 و a = 7c.
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