Ben had some grapefruits in 3 sizes. The number of medium grapefruits was twice the number of la grapefruits. The number of large grapefruits were thrice the number of small grapefruits. He sold all the small medium grapefruits. He received $368 from selling of the large grapefruits. Ben had some grapefruits in 3 sizes. He sold all the small and medium grapefruits. He received $368 from selling of the large grapefruits. (a) How many medium grapefruits did he have at first? (b) How much more did he collect from selling the medium grapefruits than the small grapefruits?

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