Question: Two types of roadbed material, one 50% rock and the other 100% rock, are used in the ratio of 4 to 1 to form a

Two types of roadbed material, one 50% rock and the other 100% rock, are used in the ratio of 4 to 1 to form a roadbed. If a total of 150 tons are used, how much rock is in the roadbed?

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