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 الأمس، قامت لارا بجمع 50 + 30 = 80 علبة ألومنيوم.
لذا فقد جمع سارة و لارا مجموعًا قدره 50 + 80 = 130 علبة ألومنيوم أمس.
اليوم، جمعوا مجموعًا من 40 + 70 = 110 علبة ألومنيوم.
لذا فإنهم قاموا بجمع 130 - 110 = 20 علبة أقل اليوم مقارنة بالأمس.
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