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MGSM / 凯莉和罗伯特喜欢去海滩收集贝壳。周一,凯莉比罗伯特多收集了 5 枚贝壳,罗伯特收集了 20 枚贝壳。周二,凯莉收集的贝壳比她周一收集的多出 2 倍。凯莉周二收集…

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凯莉和罗伯特喜欢去海滩收集贝壳。周一,凯莉比罗伯特多收集了 5 枚贝壳,罗伯特收集了 20 枚贝壳。周二,凯莉收集的贝壳比她周一收集的多出 2 倍。凯莉周二收集了多少贝壳?

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