A metallic part of a machine is made from a mixture of copper, zinc and lead mixed in the ratio of 13 : 6 : 1. If the weight of zinc in this part is 90 kg, then the total weight of the part will be:

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Answer: (D) 300 kg

Explanation

Zinc is 6 of 20 parts. 6 parts = 90 kg, so 1 part = 15 kg and the whole = 20 × 15 = 300 kg.